EP3873255B1

EP3873255B1 - Smoking substitute consumable

Info

Publication number: EP3873255B1
Application number: EP19797616.0A
Authority: EP
Inventors: Kate FERRIE; Mido ELMY; Edward Ross SHENTON
Original assignee: Imperial Tobacco Ltd Great Britain
Current assignee: IMPERIAL TOBACCO Ltd
Priority date: 2018-10-29
Filing date: 2019-10-25
Publication date: 2024-02-07
Anticipated expiration: 2039-10-25
Also published as: PL3873255T3; WO2020089067A1; EP4385342A2; GB201817542D0; EP4385342A3; EP3873255A1

Description

Field of the Disclosure

The present disclosure relates to a consumable for use in a smoking substitute system and particularly, although not exclusively, to a heat-not-burn (HNB) consumable.

Background

The smoking of tobacco is generally considered to expose a smoker to potentially harmful substances. It is generally thought that a significant amount of the potentially harmful substances are generated through the heat caused by the burning and/or combustion of the tobacco and the constituents of the burnt tobacco in the tobacco smoke itself.
Conventional combustible smoking articles, such as cigarettes, typically comprise a cylindrical rod of tobacco comprising shreds of tobacco which is surrounded by a wrapper, and usually also a cylindrical filter axially aligned in an abutting relationship with the wrapped tobacco rod. The filter typically comprises a filtration material which is circumscribed by a plug wrap. The wrapped tobacco rod and the filter are joined together by a wrapped band of tipping paper that circumscribes the entire length of the filter and an adjacent portion of the wrapped tobacco rod. A conventional cigarette of this type is used by lighting the end opposite to the filter, and burning the tobacco rod. The smoker receives mainstream smoke into their mouth by drawing on the mouth end or filter end of the cigarette.
Combustion of organic material such as tobacco is known to produce tar and other potentially harmful byproducts. There have been proposed various smoking substitute systems (or "substitute smoking systems") in order to avoid the smoking of tobacco.
Such smoking substitute systems can form part of nicotine replacement therapies aimed at people who wish to stop smoking and overcome a dependence on nicotine.
Smoking substitute systems include electronic systems that permit a user to simulate the act of smoking by producing an aerosol (also referred to as a "vapour") that is drawn into the lungs through the mouth (inhaled) and then exhaled. The inhaled aerosol typically bears nicotine and/or flavourings without, or with fewer of, the odour and health risks associated with traditional smoking.
In general, smoking substitute systems are intended to provide a substitute for the rituals of smoking, whilst providing the user with a similar experience and satisfaction to those experienced with traditional smoking and with combustible tobacco products. Some smoking substitute systems use smoking substitute articles that are designed to resemble a traditional cigarette and are cylindrical in form with a mouthpiece at one end.
The popularity and use of smoking substitute systems has grown rapidly in the past few years. Although originally marketed as an aid to assist habitual smokers wishing to quit tobacco smoking, consumers are increasingly viewing smoking substitute systems as desirable lifestyle accessories.
There are a number of different categories of smoking substitute systems, each utilising a different smoking substitute approach.
One approach for a smoking substitute system is the so-called "heat not burn" ("HNB") approach in which tobacco (rather than an "e-liquid") is heated or warmed to release vapour. The tobacco may be leaf tobacco or reconstituted tobacco. The vapour may contain nicotine and/or flavourings. In the HNB approach the intention is that the tobacco is heated but not burned, i.e. the tobacco does not undergo combustion.
A typical HNB smoking substitute system may include a device and a consumable. The consumable may include the tobacco material. The device and consumable may be configured to be physically coupled together. In use, heat may be imparted to the tobacco material by a heating element of the device, wherein airflow through the tobacco material causes moisture in the tobacco material to be released as vapour. A vapour may also be formed from a carrier in the tobacco material (this carrier may for example include propylene glycol and/or vegetable glycerine) and additionally volatile compounds released from the tobacco. The released vapour may be entrained in the airflow drawn through the tobacco.
As the vapour passes through the consumable (entrained in the airflow) from an inlet to a mouthpiece (outlet), the vapour cools and condenses to form an aerosol for inhalation by the user. The aerosol will normally contain the volatile compounds.
In HNB smoking substitute systems, heating as opposed to burning the tobacco material is believed to cause fewer, or smaller quantities, of the more harmful compounds ordinarily produced during smoking. Consequently, the HNB approach may reduce the odour and/or health risks that can arise through the burning, combustion and pyrolytic degradation of tobacco.
EP2550877A1 discloses a conventional smoking article.
There is a need for improved design of HNB consumables to enhance the user experience and improve the function of the HNB smoking substitute system.
The present disclosure has been devised in the light of the above considerations.

Summary of the Disclosure

At its most general, the present disclosure relates to an aerosol-forming article e.g. a smoking substitute article such as an HNB consumable comprising a cavity in an aerosol-forming material, the cavity housing a vapour modifier for modifying the vapour released during heating of the aerosol-forming material. According to a first aspect, the present invention provides an aerosol-forming article (e.g. a smoking substitute article such as an HNB consumable) as defined by claim 1.
By providing an aerosol-forming substrate having a vapour modifier within a cavity spacing first and second portions of an aerosol-forming material, the user experience can be tailored and thereby enhanced. The vapour modifier can be selected such that the user is exposed to a vapour/an aerosol having different properties e.g. a modified flavour and/or modified strength of volatile compounds and/or modified visible vapour volume.
The term "vapour modifier" is intended to refer to a component, e.g. a material, compound or substrate that modifies the vapour generated by the aerosol-forming substrate e.g. that modifies the flavour of and/or the strength of volatile compound in and/or the visible vapour (total particulate matter TPM) of the vapour generated by the aerosol-forming substrate.
As used herein, the terms "upstream" and "downstream" are intended to refer to the flow direction of the vapour/aerosol i.e. with the downstream end of the consumable being the mouth end or outlet where the aerosol exits the consumable for inhalation by the user. The upstream end of the consumable is the opposing end to the downstream end.
The first, upstream portion of aerosol-forming material and the second, downstream portion of aerosol-forming material are both formed of the same aerosol-forming material i.e. are both formed from a first aerosol-forming material. In other words, the cavity and vapour modifier are sandwiched between two portions of the first aerosol-forming material.
The vapour modifier comprises a second aerosol-forming material. The second aerosol-forming material is different to aerosol-forming material used to form the first and second portions of the aerosol-forming substrate e.g. the second aerosol-forming material is different to the first aerosol-forming material.
There is provided an article/HNB consumable comprising an aerosol-forming substrate wherein the aerosol-forming substrate comprises two portions of a first aerosol-forming material sandwiching an axially interposed portion of a second aerosol-forming material.
The aerosol-forming substrate is capable of being heated to release at least one volatile compound that can form an aerosol. The aerosol-forming substrate may be located at the upstream end of the consumable.
In order to generate an aerosol, the first and second aerosol-forming material comprises at least one volatile compound that is intended to be vaporised/aerosolised and that may provide the user with a recreational and/or medicinal effect when inhaled. The chemical and/or physiologically active volatile compounds include nicotine, and optionally the group consisting of: cocaine, caffeine, opiates and opoids, cathine and cathinone, kavalactones, mysticin, beta-carboline alkaloids, salvinorin A together with any combinations, functional equivalents to, and/or synthetic alternatives of the foregoing.
The first and second aerosol-forming materials both comprise plant material. The plant material being Nicotiana species (Tobacco). The aerosol-forming material may further comprise at least one plant material selected from the list including Amaranthus dubius, Arctostaphylos uva-ursi (Bearberry), Argemone mexicana, Amica, Artemisia vulgaris, Yellow Tees, Galea zacatechichi, Canavalia maritima (Baybean), Cecropia mexicana (Guamura), Cestrum noctumum, Cynoglossum virginianum (wild comfrey), Cytisus scoparius, Damiana, Entada rheedii, Eschscholzia califomica (California Poppy), Fittonia albivenis, Hippobroma longiflora, Humulus japonica (Japanese Hops), Humulus lupulus (Hops), Lactuca virosa (Lettuce Opium), Laggera alata, Leonotis leonurus, Leonurus cardiaca (Motherwort), Leonurus sibiricus (Honeyweed), Lobelia cardinalis, Lobelia inflata (Indian-tobacco), Lobelia siphilitica, Nepeta cataria (Catnip), Nymphaea alba (White Lily), Nymphaea caerulea (Blue Lily), Opium poppy, Passiflora incamata (Passionflower), Pedicularis densiflora (Indian Warrior), Pedicularis groenlandica (Elephant's Head), Salvia divinorum, Salvia dorrii (Tobacco Sage), Salvia species (Sage), Scutellaria galericulata, Scutellaria lateriflora, Scutellaria nana, Scutellaria species (Skullcap), Sida acuta (Wireweed), Sida rhombifolia, Silene capensis, Syzygium aromaticum (Clove), Tagetes lucida (Mexican Tarragon), Tarchonanthus camphoratus, Tumera diffusa (Damiana), Verbascum (Mullein), Zamia latifolia (Maconha Brava) together with any combinations, functional equivalents to, and/or synthetic alternatives of the foregoing.
The first aerosol-forming material and the second aerosol-forming material comprises tobacco which will contain nicotine as a volatile compound.
Any type of tobacco may be used. This includes, but is not limited to, flue-cured tobacco, burley tobacco, Maryland Tobacco, dark-air cured tobacco, oriental tobacco, dark-fired tobacco, perique tobacco and rustica tobacco. This also includes blends of the above mentioned tobaccos.
Any suitable parts of the tobacco plant may be used. This includes leaves, stems, roots, bark, seeds and flowers.
The aerosol-forming material forming the upstream and downstream portions (e.g. the first aerosol-forming material) comprises reconstituted tobacco (e.g. slurry recon or paper recon), and may further comprise one or more of tobacco, tobacco derivatives, expanded tobacco, and/or shredded tobacco.
The aerosol-forming material forming the upstream and downstream portions (e.g. the first aerosol-forming material) may comprise a gathered sheet of homogenised (e.g. paper/slurry recon) tobacco or gathered shreds/strips formed from such a sheet.
In some embodiments, the sheet used to form the first aerosol-forming material has a grammage greater than or equal to 100 g/m², e.g. greater than or equal to 110 g/m² such as greater than or equal to 120 g/m².
The sheet may have a grammage of less than or equal to 300 g/m² e.g. less than or equal to 250 g/m² or less than or equal to 200 g/m².
The sheet may have a grammage of between 120 and 190 g/m².
The first aerosol-forming material may comprise at least 50 wt% plant material, e.g. at least 60 wt% plant material e.g. around 65 wt% plant material. The aerosol-forming substrate may comprise 80 wt% or less plant material e.g. 75 or 70 wt% or less plant material.
The second aerosol-forming material comprises extruded tobacco. For example, the second aerosol-forming material may comprise pellets, granules or chips of extruded tobacco.
Extruded tobacco can be produced by forming a liquid mixture of powered tobacco and a binding agent such as a gum (e.g. xanthan, guar, arabic and/or locust bean gum). The liquid mixture is heated and then extruded through a die. The extrudate is dried and then may be subsequently cut into pellets, chips or granules.
The first and second portions of the aerosol-forming substrate both comprise reconstituted tobacco (e.g. shreds/strip of a sheet of recon tobacco) and the second aerosol-forming material (housed within the cavity) comprises extruded tobacco (e.g. pellet/chips/granules of extruded tobacco). The extruded tobacco housed in the cavity will deliver a vapour with a higher nicotine content than the reconstituted tobacco portions.
In other embodiments, the vapour modifier is an additive carrier. In these embodiments, the aerosol-forming material forming the first and second portions of the aerosol-forming substrate (e.g. the first aerosol-forming material) may be as described above). There is provided an article/HNB consumable comprising an aerosol-forming substrate wherein the aerosol-forming substrate comprises two portions of an aerosol-forming material sandwiching an additive carrier.
In other arrangements outside of the scope of the present invention, the additive carrier may be a capsule or micro-moulding e.g. a crushable or meltable capsule or micro-moulding having a crushable or meltable outer shell containing the additive. The additive carrier may be substantially spherical.
The additive carrier may include an additive selected from humectants or flavourants.
Suitable humectants include polyhydric alcohols (e.g. propylene glycol (PG), triethylene glycol, 1,2-butane diol and vegetable glycerine (VG)) and their esters (e.g. glycerol mono-, di- or tri-acetate). Inclusion of an humectant in the additive carrier within the cavity allows the generation of an increased amount of visible vapour potentially at lower temperatures.
The flavourant may be provided in solid or liquid form within the additive carrier. It may include menthol, liquorice, chocolate, fruit flavour (including e.g. citrus, cherry etc.), vanilla, spice (e.g. ginger, cinnamon) and tobacco flavour.
The aerosol-forming substrate e.g. the first and/or second aerosol-forming material may further comprise one or more additives selected from humectants, flavourants, fillers, aqueous/non-aqueous solvents and binders.
Humectants are provided as vapour generators - the resulting vapour helps carry the volatile active compounds and increases visible vapour. Suitable humectants include polyhydric alcohols (e.g. propylene glycol (PG), triethylene glycol, 1,2-butane diol and vegetable glycerine (VG)) and their esters (e.g. glycerol mono-, di- or tri-acetate). They may be present in the aerosol-forming substrate in an amount between 1 and 50 wt%.
The humectant content of the aerosol-forming substrate may have a lower limit of at least 1 % by weight of the plant material, such as at least 2 wt %, such as at least 5 wt %, such as at least 10 wt %, such as at least 20 wt %, such as at least 30 wt %, or such as least 40 wt %.
The humectant content of the aerosol-forming substrate may have an upper limit of at most 50 % by weight of the plant material, such as at most 40 wt %, such as at most 30 wt %, or such as at most 20 wt %.
Preferably, the humectant content is 1 to 40 wt % of the aerosol-forming substrate, such as 1 to 20 wt %
Suitable binders are known in the art and may act to bind together the components forming the aerosol-forming substrate. Binders may comprise starches and/or cellulosic binders such as methyl cellulose, ethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose and methyl cellulose, gums such as xanthan, guar, arabic and/or locust bean gum, organic acids and their salts such as alginic acid/ sodium alginate, agar and pectins.
Preferably the binder content is 5 to 10 wt% of the aerosol-forming substrate e.g. around 6 to 8 wt%.
Suitable fillers are known in the art and may act to strengthen the aerosol-forming substrate. Fillers may comprise fibrous (non-tobacco) fillers such as cellulose fibres, lignocellulose fibres (e.g. wood fibres), jute fibres and combinations thereof.
Preferably, the filler content is 5 to 10 wt% of the aerosol-forming substrate e.g. around 6 to 9 wt%.
The aerosol-forming substrate may comprise an aqueous and/or non-aqueous solvent. In some embodiments, the aerosol forming substrate has a water content of between 5 and 10 wt% e.g. between 6-9 wt% such as between 7-9 wt%.
The flavourant may be provided in solid or liquid form. It may include menthol, liquorice, chocolate, fruit flavour (including e.g. citrus, cherry etc.), vanilla, spice (e.g. ginger, cinnamon) and tobacco flavour. The flavourant may be evenly dispersed/dosed throughout the first and/or second aerosol-forming material.
The aerosol-forming substrate may be formed in a substantially cylindrical shape such that the consumable resembles a conventional cigarette. It may have a diameter of between 5 and 10mm e.g. between 6 and 9mm or 6 and 8mm e.g. around 7 mm.
Each of the first/second portions of aerosol-forming material may have an axial length of between 5 and 10mm e.g. between 6 and 9mm or 6 and 9mm such as around 7mm.
The cavity may have an axial length of around 3 to 7mm, e.g. 4 or 5 to 6mm such as around 6mm.
The aerosol-forming substrate may be circumscribed by a wrapping layer e.g. a paper wrapping layer. The wrapping layer may overlie an inner foil layer or may comprise a paper/foil laminate (with the foil innermost).
The article/consumable may comprise at least one filter element. There may be a terminal filter element at the downstream/mouth end of the article/consumable.
The or at least one of the filter element(s) (e.g. the terminal filter element) may be comprised of cellulose acetate or polypropylene tow. The at least one filter element (e.g. the terminal filter element) may be comprised of activated charcoal. The at least one filter element (e.g. the terminal element) may be comprised of paper. The or each filter element may be at least partly (e.g. entirely) circumscribed with a plug wrap e.g. a paper plug wrap.
The or each filter element may have a substantially cylindrical shape with a diameter substantially matching the diameter of the aerosol-forming substrate (with or without its associated wrapping layer). The axial length of the or each filter element may be less than 20mm, e.g. between 8 and 15mm, for example between 9 and 13 mm e.g. between 10 and 12mm.
The or at least one of the filter element(s) may be a solid filter element. The or at least one of the filter element(s) may be a hollow bore filter element. The or each hollow bore filter may have a bore diameter of between 1 and 5 mm, e.g. between 2 and 4 mm or between 2 and 3 mm.
There may be a plurality of e.g. two filter elements which may be adjacent one another or which may be spaced apart. Any filter element(s) upstream of the terminal filter element may be circumscribed by the (paper) wrapping layer.
The terminal filter element (at the downstream end of the article/consumable) may be joined to the upstream elements forming the article/consumable by a circumscribing tipping layer e.g. a tipping paper layer. The tipping paper may have an axial length longer than the axial length of the terminal filter element such that the tipping paper completely circumscribes the terminal filter element plus the wrapping layer surrounding any adjacent upstream element.
The or at least one of the filter elements e.g. the terminal filter element may include a capsule e.g. a crushable capsule (crush-ball) containing a liquid flavourant e.g. a liquid flavourant as described above. The capsule can be crushed by the user during smoking of the consumable to release the flavourant. The capsule may be located at the axial centre of the terminal filter element.
In some embodiments, the article/consumable may comprise an aerosol-cooling element which is adapted to cool the aerosol generated from the aerosol-forming substrate (by heat exchange) before being inhaled by the user.
The aerosol-cooling element will be downstream from the aerosol-forming substrate. For example, it may be between the aerosol-forming substrate and a/the filter element and/or between two filter elements. The aerosol cooling element may be at least partly (e.g. entirely) circumscribed by the (paper) wrapping layer.
The aerosol-cooling element may be formed of a plastics material selected from the group consisting of polylactic acid (PLA), polyvinyl chloride (PVC), polyethylene (PE) and polyethylene terephthalate (PET). The aerosol-cooling element may be formed of a crimped/gathered sheet of material to form a structure having a high surface area with a plurality of longitudinal channels to maximise heat exchange and cooling of the aerosol.
The article/consumable may comprise a spacer element that defines a space or cavity between the aerosol-forming substrate and the downstream end of the consumable. The spacer element may comprise a cardboard tube. The spacer element may be circumscribed by the (paper) wrapping layer.
The spacer element may have an external diameter of between 5 and 10mm e.g. between 6 and 9mm or 6 and 8mm e.g. around 7 mm. It may have an axial length of between 10 and 15mm e.g. between 12 and 14 mm or 13 and 14mm e.g. around 14mm.
In a second aspect, there is provided a system comprising an article/consumable according to the first aspect and a device comprising a heating element.
The device may be a HNB device i.e. a device adapted to heat but not combust the aerosol-forming substrate.
The device may comprise a main body for housing the heating element. The heating element may comprise an elongated e.g. rod, tube-shaped or blade heating element. The heating element may project into or surround a cavity within the main body for receiving the article/consumable.
The device (e.g. the main body) may further comprise an electrical power supply e.g. a (rechargeable) battery for powering the heating element. It may further comprise a control unit to control the supply of power to the heating element.
In a third aspect, there is provided a method of using a system according to the second aspect, the method comprising:

inserting the article/consumable into the device; and
heating the article/consumable using the heating element.

In some embodiments, the method comprises inserting the article/consumable into a cavity within the main body and penetrating the article/consumable with the heating element upon insertion of the article/consumable. For example, the heating element may penetrate the aerosol-forming substrate in the article/consumable.
The skilled person will appreciate that except where mutually exclusive, a feature or parameter described in relation to any one of the above aspects may be applied to any other aspect. Furthermore, except where mutually exclusive, any feature or parameter described herein may be applied to any aspect and/or combined with any other feature or parameter described herein.

Summary of the Figures

So that the invention may be understood, and so that further aspects and features thereof may be appreciated, embodiments illustrating the principles of the invention will now be discussed in further detail with reference to the accompanying figures, in which:

Figure 1 shows a first embodiment of an HNB consumable;
Figure 2 shows an alternative arrangement of an HNB consumable
Figure 3 shows a second embodiment of an HNB consumable; and
Figure 4 shows the first embodiment within a device forming an HNB system.

Detailed Description of the Figures

As shown in Figure 1, the HNB consumable 1 comprises an aerosol-forming substrate 2 at the upstream end of the consumable 1.
The aerosol-forming substrate 2 comprises a first, upstream portion 13 of reconstituted tobacco spaced from a second, downstream portion 14 of reconstituted tobacco by a cavity 15.
The cavity 15 is filled with granules/chips/pellets of extruded tobacco 16.
The aerosol-forming substrate 2 is dosed with 20 wt% of a humectant such as propylene glycol (PG) or vegetable glycerine (VG).
The aerosol-forming substrate 2 is formed in a substantially cylindrical shape such that the consumable resembles a conventional cigarette. It has diameter of around 7mm and each of the two portions 13, 14 of reconstituted tobacco has an axial length of around 7 mm whilst the cavity has an axial length of around 6mm.
The aerosol-forming substrate 2 is circumscribed by a paper wrapping layer 3.
The consumable 1 comprises an upstream filter element 4 and a downstream (terminal) filter element 5. The two filter elements 4, 5 and spaced by a cardboard spacer tube 6. Both filter elements 4, 5 are formed of cellulose acetate tow and wrapped with a respective paper plug layer (not shown).
Both filter elements have a substantially cylindrical shape. The diameter of the upstream filter 4 matches the diameter of the aerosol-forming substrate 2. The diameter of the terminal filter element 5 is slightly larger and matches the combined diameter of the aerosol-forming substrate 2 and the wrapping layer 3.
The upstream filter element is slightly shorter in axial length than the terminal filter element at an axial length of 10mm compared to 12mm for the terminal filter element.
The cardboard tube spacer is longer than each of the two filter portions having an axial length of around 14mm.
Each filter element 4, 5 is a hollow bore filter element with a hollow, longitudinally extending bore. The diameter of the bore in the upstream filter is slightly larger than the diameter of the bore in the terminal filter having a diameter of 3mm compared to 2 mm for the terminal filter element.
The cardboard spacer tube 6 and the upstream filter portion 4 are circumscribed by the wrapping layer 3.
The terminal filter element 5 is joined to the upstream elements forming the consumable by a circumscribing paper tipping layer 7. The tipping layer 7 encircles the terminal filter portion and has an axial length of around 20mm such that it overlays a portion of the cardboard tube spacer 6.
Figure 2 shows an alternative arrangement of a consumable 1' which is the same as that shown in Figure 1 except that the cavity 15 houses an additive carrier 17 which is a crushable capsule (crush-ball) having a shell wall containing polypropylene glycol or vegetable glycerine.
The terminal filter element 5 comprises a further crushable capsule 8 (crush-ball) having a shell wall containing a liquid menthol or cherry or vanilla flavourant. The capsule 8 is spherical and has a diameter of 3.5mm. It is positioned within the axial centre of the terminal filter portion 5. In other embodiments (not shown), the capsule 8 can be omitted.
Furthermore, the capsule could be included in the terminal filter portion 5 of the Figure 1 embodiment.
Figure 3 shows another embodiment of a consumable 1" which is the same as the first embodiment except that the wrapping layer 3 does not completely circumscribe the cardboard spacer tube 6 such that there is an annular gap 9 between the tipping layer 7 and the cardboard spacer tube 6 downstream of the end of the wrapping layer 3. In an alternative arrangement, outside of the scope of the present invention, the extruded tobacco 16 in the cavity 15 could be replaced with the crushable capsule 17 of the Figure 2 arrangement and/or the crushable capsule 8 of the Figure 2 may be included in the terminal filter portion 5.
Figure 4 shows the first embodiment inserted into an HNB device 10 comprising a rod-shaped heating element (not shown). The heating element projects into a cavity 11 within the main body 12 of the device.
The consumable 1 is inserted into the cavity 11 of the main body 12 of the device 10 such that the heating rod penetrates the aerosol-forming substrate 2. Heating of the reconstituted tobacco in the aerosol-forming substrate 2 is effected by powering the heating element (e.g. with a rechargeable battery (not shown)). As the tobacco is heated, moisture and volatile compound (e.g. nicotine) within the tobacco and the humectant are released as a vapour and entrained within an airflow generated by inhalation by the user at the terminal filter portion 5. Additive carriers 17 and/or crushable capsules 8 could, in arrangements outside of the scope of the present invention, be ruptured by pressure to modify the flavour and/or amount of visible vapour during smoking of the consumable.
As the vapour cools within the upstream filter element 4 and the cardboard spacer tube 6, it condenses to form an aerosol containing the volatile compounds for inhalation by the user.
For the avoidance of any doubt, any theoretical explanations provided herein are provided for the purposes of improving the understanding of a reader. The inventors do not wish to be bound by any of these theoretical explanations.
Any section headings used herein are for organizational purposes only and are not to be construed as limiting the subject matter described.
Throughout this specification, including the claims which follow, unless the context requires otherwise, the words "have", "comprise", and "include", and variations such as "having", "comprises", "comprising", and "including" will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.
It must be noted that, as used in the specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Ranges may be expressed herein as from "about" one particular value, and/or to "about" another particular value. When such a range is expressed, another embodiment includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by the use of the antecedent "about," it will be understood that the particular value forms another embodiment. The term "about" in relation to a numerical value is optional and means, for example, +/- 10%.
The words "preferred" and "preferably" are used herein refer to embodiments of the invention that may provide certain benefits under some circumstances. It is to be appreciated, however, that other embodiments may also be preferred under the same or different circumstances.

Claims

An aerosol-forming article (1) comprising an aerosol-forming substrate (2) wherein the aerosol-forming substrate comprises a first, upstream portion (13) of aerosol-forming material and a second, downstream portion (14) of aerosol-forming material wherein the first and second portions of aerosol-forming material are axially spaced by a cavity (15) housing a vapour modifier (17);
wherein the first portion (13) of aerosol-forming material and the second portion (14) of aerosol-forming material are both formed of a first aerosol-forming material;

wherein the vapour modifier (17) comprises a second aerosol-forming material; and

characterised in that

the first aerosol-forming material comprises reconstituted tobacco,

the second aerosol-forming material comprises extruded tobacco, and

wherein the extruded tobacco will deliver a vapour with a higher nicotine content than the first and second portions (13, 14) of aerosol-forming material.
An aerosol-forming article (1) according to claim 1 wherein the second aerosol-forming material is extruded tobacco chips/pellets/granules.
An aerosol-forming article (1) according to any one of the preceding claims wherein the first aerosol-forming material further comprises one or more of tobacco, tobacco derivatives, expanded tobacco, and/or shredded tobacco.
An aerosol-forming article (1) according to any one of the preceding claims wherein the vapour modifier (17) is an additive carrier.
An aerosol-forming article (1) according to claim 4 wherein the additive carrier (17) contains a humectant or a flavourant.
A smoking substitute system comprising an article (1) according to any one of the preceding claims and a device (10) comprising a heating element.
A system according to claim 6 wherein the device (10) comprises a main body (12) for housing the heating element and the heating element comprises an elongated heating element.
A method of using the system according to claim 6 or 7, the method comprising:
inserting the article (1) into the device (10); and

heating the article (1) using the heating element.
A method according to claim 8 comprising inserting the article into a cavity (11) within a main body (12) of the device (10) and penetrating the article with the heating element upon insertion of the article (1).