Aerosol-generating device with multiple heating chambers

Abstract

The invention relates to an aerosol-generating device comprising a first cavity (10) for receiving a first aerosol-generating article, a first heater assembly (12) configured for heating the first aerosol-generating article in the first cavity (10), a second cavity (14) for receiving a second aerosol-generating article, a second heater assembly (16) configured for heating the second aerosol-generating article in the second cavity (14), and an airflow path extending between at least one air inlet and at least one air outlet (18) of the device. The first cavity (10) and the second cavity (14) are arranged in the airflow path. The device is configured to vary, for different puffs of a user session, a ratio of an amount of substances provided to the at least one air outlet (18) from the first cavity (10) to an amount of substances provided to the at least one air outlet (18) from the second cavity (14). The invention further relates to an aerosol-generating system. The invention further relates to a method for operating an aerosol-generating system.

Description

[0001] New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0002] -1-

[0003] AEROSOL-GENERATING DEVICE WITH MULTIPLE HEATING CHAMBERS

[0004] The present invention relates to an aerosol-generating device. The present invention further relates to an aerosol-generating system. The present invention further relates to a method for operating an aerosol-generating system.

[0005] It is known to provide an aerosol-generating device for generating an inhalable vapor. Such devices may heat an aerosol-forming substrate to a temperature at which one or more components of the aerosol-forming substrate are volatilised without burning the aerosolforming substrate. The aerosol-forming substrate may be provided as part of an aerosolgenerating article. The aerosol-generating article may have a rod shape for insertion of the aerosol-generating article into a cavity, such as a heating chamber, of the aerosol-generating device. It is also known to use aerosol-forming substrates and aerosol-generating articles having other shapes, for example cuboid or sheet-like shapes, for insertion into the device cavity. A heating element may be arranged in or around the heating chamber for heating the aerosol-forming substrate once the aerosol-generating article is inserted into the heating chamber of the aerosol-generating device.

[0006] It is known to provide an aerosol-generating article that allows to provide several puffs during a user session, for example 8 to 12 puffs, before being depleted.

[0007] It might be the case that a user experiences a reduced flavor intensity over time within a user session. Such reduction in flavor can be attributed to the saturation of flavor receptors in the taste buds of the user, which become fully activated and less responsive with prolonged exposure to the same flavor. As a result, a user's ability to perceive the flavor may diminish which may lead to a less enjoyable experience. This phenomenon is also sometimes referred to as “flavor fatigue". Additionally, flavor perception can fade due to general use of the consumable. For example, there may be a stronger flavor release from an article at the beginning of a user session compared to the puffs towards the end of a user session.

[0008] It would be desirable to provide an aerosol-generating device with improved aerosol delivery management. It would be desirable to provide an aerosol-generating device with more constant aerosol delivery. It would be desirable to provide an aerosol-generating device with more constant aerosol delivery throughout a user session comprising a plurality of puffs. It would be desirable to provide an aerosol-generating device with more constant flavour delivery. It would be desirable to provide an aerosol-generating device with more constant flavour delivery throughout a user session comprising a plurality of puffs. It would be desirable to provide an aerosol-generating device with more constant flavour experienced by a user throughout a user session comprising a plurality of puffs. It would be desirable to provide an aerosol-generating device with customization possibilities. It would be desirable to provide an aerosol-generating device that allows using different aerosol-forming substrates. It would be New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0009] -2- desirable to provide an aerosol-generating device that allows using different combinations of aerosol-forming substrates.

[0010] According to an embodiment of the invention there is provided an aerosol-generating device. The aerosol-generating device may comprise a first cavity for receiving a first aerosolgenerating article. The aerosol-generating device may comprise a first heater assembly configured for heating the first aerosol-generating article in the first cavity. The aerosolgenerating device may comprise a second cavity for receiving a second aerosol-generating article. The aerosol-generating device may comprise a second heater assembly configured for heating the second aerosol-generating article in the second cavity. The aerosol-generating device may comprise an airflow path extending between at least one air inlet and at least one air outlet of the device. The first cavity may be arranged in the airflow path. The second cavity may be arranged in the airflow path. The aerosol-generating device may be configured to vary, for different puffs of a user session, a ratio of an amount of substances provided to the at least one air outlet from the first cavity to an amount of substances provided to the at least one air outlet from the second cavity.

[0011] According to an embodiment of the invention there is provided an aerosol-generating device. The aerosol-generating device comprises a first cavity for receiving a first aerosolgenerating article. The aerosol-generating device comprises a first heater assembly configured for heating the first aerosol-generating article in the first cavity. The aerosol-generating device comprises a second cavity for receiving a second aerosol-generating article. The aerosolgenerating device comprises a second heater assembly configured for heating the second aerosol-generating article in the second cavity. The aerosol-generating device comprises an airflow path extending between at least one air inlet and at least one air outlet of the device. The first cavity and the second cavity are arranged in the airflow path. The aerosol-generating device is configured to vary, for different puffs of a user session, a ratio of an amount of substances provided to the at least one air outlet from the first cavity to an amount of substances provided to the at least one air outlet from the second cavity.

[0012] An aerosol-generating device with improved aerosol delivery management may be provided. An aerosol-generating device with more constant aerosol delivery may be provided. An aerosol-generating device with more constant aerosol delivery throughout a user session comprising a plurality of puffs may be provided. An aerosol-generating device with more constant flavour delivery may be provided. An aerosol-generating device with more constant flavour delivery throughout a user session comprising a plurality of puffs may be provided. An aerosol-generating device with customization possibilities may be provided. An aerosolgenerating device that allows using different aerosol-forming substrates may be provided. An aerosol-generating device that allows using different combinations of aerosol-forming substrates may be provided. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0013] -3-

[0014] For example, by means of the two separate cavities and associated heater assemblies, the aerosol-generating device may allow for the customizability of separate heating profiles for the first and second aerosol-generating articles to maximize and enhance aerosol delivery and flavor perception. For example, flavor perception may be made more consistent throughout a user session by controlled release of flavored aerosol from the second cavity. By means of the two aerosol-generating articles, various combinations of different flavors and use modes may be possible. Further, by means of the two separate cavities and associated heater assemblies, even further customization is made possible.

[0015] The aerosol-generating device may be configured to provide, for different puffs of a user session, different amounts of substance released from the second cavity to the at least one air outlet. For example, the composition of the aerosol provided to the at least one air outlet may be purposefully changed for different puffs of a user session. For example, the amount of flavor provided to a user may be changed during the user session to account for a flavor fatigue. For example, the amounts of substance released from the second cavity to the at least one air outlet may be varied for different puffs of a user session to account for a successive depletion and altering of the first aerosol-generating article throughout the user session.

[0016] The aerosol-generating device may be configured to vary, for different puffs of a user session, a ratio of an amount of substances provided to the at least one air outlet from the first cavity to an amount of substances provided to the at least one air outlet from the second cavity.

[0017] As used herein, the term “amount of substances” refers to the sum of the masses of volatized substances which have been released from the respective first or second aerosolgenerating article and have been taken up by the airflow and are provided to the at least one air outlet for a respective puff. For example, for a first puff of a user session, the first and second heater assemblies may be activated. For a second puff of the user session, the second heater assembly may be inactivated such that no or less substances are volatized from the second aerosol-generating article for said second puff, whilst the first heater assembly is activated for said second puff. Hence, the amount of substances provided from the first cavity maintains mainly the same for both the first and second puffs. The amount of substances provided from the second cavity may be significantly lower for the second puff compared to the first puff, such that the ratio of an amount of substances provided to the at least one air outlet from the first cavity to an amount of substances provided to the at least one air outlet from the second cavity will change to become higher for the second puff compared to the first puff.

[0018] The aerosol-generating device may be configured to vary, for different puffs of a user session, a ratio of a total mass of substances provided to the at least one air outlet from the New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0019] -4- first cavity to a total mass of substances provided to the at least one air outlet from the second cavity.

[0020] As used herein, the term “user session” refers to a usage of the device in which a user consecutively takes a plurality of puffs from the aerosol-generating device. The user session typically takes a couple of minutes, for example between 1 minute and 15 minutes. For example, a user session may comprise between 5 and 25 puffs.

[0021] The aerosol-generating device may be configured to count the puffs during a user session. For example, the aerosol-generating device may comprise a puff sensor. The puff sensor may sense when a puff occurs during a user session. The puff sensor may be used for counting the puffs. For example, the aerosol-generating device may comprise a timer. The timer may measure the time elapsed during a user session. Based on the elapsed time, the device may estimate a current puff number for each moment in time during a user session.

[0022] As used herein, the term “enriched airflow” refers to an airflow carrying volatized substances which have been volatized from an aerosol-generating article. A “first enriched airflow” refers to an airflow carrying volatized substances which have been volatized from the first aerosol-generating article in the first cavity. A “second enriched airflow” refers to an airflow carrying volatized substances which have been volatized from the second aerosol-generating article in the second cavity.

[0023] As used herein, the term “mixed airflow” refers to the total airflow provided to the at least one air outlet of the aerosol-generating device during use. The mixed airflow comprises the first enriched airflow and the second enriched airflow. It may be that, during one or more puffs of a user session, the amount of the second enriched airflow in the mixed airflow is zero or near zero. In such case, the mixed airflow comprises only, or nearly only, the first enriched airflow.

[0024] The aerosol-generating device may be configured to vary, for different puffs of a user session, a ratio of the first of enriched airflow to the second enriched airflow in the mixed airflow provided to the at least one air outlet.

[0025] The aerosol-generating device may be configured such that heating of the first and second cavities is individually controllable. The aerosol-generating device may be configured such that the first and second heater assemblies are individually controllable.

[0026] The aerosol-generating device may be configured to allow heating the first and second cavities at different temperatures. The aerosol-generating device may be configured to allow heating the first and second cavities at different moments in time.

[0027] The aerosol-generating device may be configured to activate heating of the first heater assembly for each puff of the plurality of puffs of a user session.

[0028] The aerosol-generating device may be configured to activate heating of the second heater assembly for at least one of the plurality of puffs of a user session, and to inactivate or New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0029] -5- reduce heating of the second heater assembly for at least another one of the plurality of puffs of the user session.

[0030] The aerosol-generating device may be configured to apply a different activation profile of the first heater assembly compared to the second heater assembly over a plurality of puffs of a user session.

[0031] The aerosol-generating device may be configured to activate or inactivate or reduce heating of the second heater assembly for at least one of the plurality of puffs of the user session based on a signal received from a sensor and / or a decision-making routine.

[0032] The aerosol-generating device may be configured to activate or inactivate or reduce heating of the second heater assembly for at least one of the plurality of puffs of the user session based on a predetermined heating scheme for the user session.

[0033] The aerosol-generating device may be configured to select a heating scheme for one or both of the first and second heater assemblies in dependence of a specific type of aerosolgenerating article inserted into the respective cavity. The aerosol-generating device may be configured to select the heating scheme from a database stored on the device. The aerosolgenerating device may be configured to select a heating scheme in dependence of a specific type of first and / or second aerosol-generating article. The aerosol-generating device may comprise an article detection means for determining which specific type of aerosol-generating article is inserted into the respective cavity. The article detection means may comprise a sensor assembly. The sensor assembly may comprise an optical sensor.

[0034] For example, a user may input information on the specific type of article via a user interface of the aerosol-generating device. For example, the aerosol-generating device may comprise a sensor assembly for detecting a specific type of article. For example, different types of aerosol-generating articles may be provided with different colors on a color-coded area of the articles to indicate one or both of a type of and an amount of aerosol-forming substrate present in the article. The sensor assembly of the aerosol-generating device may comprise a color sensor for detecting the color of the color-coded area provided on the aerosol-generating article inserted into the respective cavity. Depending on the color, the aerosol-generating device may then select an article-specific heating scheme from a database. The database may comprise a list of different heating schemes for different colors.

[0035] The aerosol-generating device may adjust a maximum power applied to the respective heater assembly based on the selected heating scheme. By adjusting the power applied to the heater assembly, the maximum temperature reached in the cavity may be adjusted. For example, different aerosol-forming substrates may require a different heating temperature to release flavor. The aerosol-generating device may thus select an optimum temperature for a given type of aerosol-generating article. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0036] -6-

[0037] The aerosol-generating device may select during which puffs to apply power to the respective heater assembly based on the selected heating scheme. For example, different aerosol-forming substrates may require a different time of release during a user session. The aerosol-generating device may thus select an optimum release time for a given type of aerosolgenerating article.

[0038] The aerosol-generating device may both adjust a maximum power applied to the respective heater assembly and select during which puffs to apply power to the respective heater assembly based on the selected heating scheme. The aerosol-generating device may select an optimum heating profile for the specific type of aerosol-generating article inserted into the respective cavity.

[0039] The aerosol-generating device may be configured to select a heating scheme for each heater assembly based on information on both the articles in both cavities. An optimum heating scheme for a specific combination of articles may thereby be selected.

[0040] The aerosol-generating device may be configured to activate or inactivate or reduce heating of the second heater assembly for at least one of the plurality of puffs of the user session based on the specific type of second aerosol-generating article inserted into the second cavity. The aerosol-generating device may be configured to activate or inactivate or reduce heating of the first heater assembly for at least one of the plurality of puffs of the user session based on the specific type of first aerosol-generating article inserted into the first cavity.

[0041] The aerosol-generating device may be configured to activate heating of the second heater assembly for one or more initial puffs of the user session. The one or more initial puffs may encompass the first puff, the first and second puffs, the first to third puffs, the first to fourth puffs, or the first to fifth puffs of the user session.

[0042] The aerosol-generating device may be configured not to activate heating of the second heater assembly for one or more puffs after the initial puffs of the user session. The aerosolgenerating device may be configured to reduce heating of the second heater assembly for one or more puffs after the initial puffs of the user session.

[0043] The aerosol-generating device may be configured to alternatingly activate heating of the second heater assembly, and inactivate or reduce heating of the second heater assembly for a sequence of consecutive puffs of the plurality of puffs of the user session.

[0044] The aerosol-generating device may be configured to activate heating of the second heater assembly only for each other puff of the user session after the initial puffs. For example, the aerosol-generating device may be configured to activate heating of the second heater assembly for each puff during the first four or five puffs of a user session, and to, then, activate the heating of the second heater assembly only for each other puff of the user session after the four or five initial puffs. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0045] -7-

[0046] The aerosol-generating device may be configured to activate heating of the second heater assembly only for some of the puffs of the user session after the initial puffs. For example, the aerosol-generating device may be configured to activate heating of the second heater assembly for each puff during the first four or five puffs of a user session, and to, then, activate the heating of the second heater assembly only for each third puff of the user session after the four or five initial puffs.

[0047] The first cavity and the second cavity may be arranged in parallel in the airflow path.

[0048] The aerosol-generating device may comprise a holding chamber. The holding chamber may be arranged downstream of the second cavity in the airflow path. The holding chamber may be arranged in series with the second cavity in the airflow path. The holding chamber may be arranged in parallel to the first cavity in the airflow path.

[0049] During use, the holding chamber may accumulate a second enriched airflow stemming from the second cavity and comprising volatized compounds stemming from the second aerosol-generating article received in the second cavity. The holding chamber may release portions of the accumulated second enriched airflow towards the air outlet during each puff. Thereby, a more consistent flavor release may be achieved. The holding chamber may release portions of the accumulated second enriched airflow towards the air outlet even during those puffs where no further second enriched airflow is released from the second cavity, for example when the second heater assembly is inactive. The holding chamber may help providing a consistent flavor release from the second cavity to a user during a user session. The holding chamber may help providing a more regulated dosage by storing the aerosol in the holding chamber after each flavor puff.

[0050] The holding chamber may comprise a holding chamber outlet portion. The holding chamber outlet portion may have a smaller diameter compared to the remainder of the airflow path downstream of the first and second cavities. Where an outlet channel of the first cavity has a larger diameter compared to the holding chamber outlet portion, there may be a more straightforward aerosol pathway from the first cavity. Thereby, a portion of the flavored aerosol from the holding chamber may be pulled from the holding chamber, for example also during those puffing periods when the heater assembly of the second cavity is inactive. This may deliver a less intense, more consistent metered dose of flavored aerosol each puff, instead of delivering the full flavor dose only during the active puffs.

[0051] The aerosol-generating device may comprise a main outlet channel. The main outlet channel may define a downstream end of the airflow path. The main outlet channel may extend in the airflow path to the at least one air outlet. The aerosol-generating device may comprise a first cavity outlet channel extending in the airflow path from the first cavity to the main outlet channel. The aerosol-generating device may comprise a second cavity outlet channel extending in the airflow path from the second cavity to the main outlet channel. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0052] -8-

[0053] The first cavity outlet channel and the second cavity outlet channel may be arranged in parallel in the airflow path.

[0054] The second cavity outlet channel may comprise the holding chamber. The holding chamber may be arranged between an upstream portion and a downstream portion of the second cavity outlet channel.

[0055] An inner diameter of the holding chamber may exceed an inner diameter of the downstream portion of the second cavity outlet channel. A cross-sectional area of the holding chamber may exceed a cross-sectional area of the downstream portion of the second cavity outlet channel.

[0056] The “cross-sectional area” of a channel or channel portion may be measured in a direction perpendicular to the principal flow axis of the airflow through the channel or channel portion.

[0057] The inner diameter of the first cavity outlet channel may exceed the inner diameter of the downstream portion of the second cavity outlet channel. The inner diameter of the main outlet channel may exceed the inner diameter of the downstream portion of the second cavity outlet channel.

[0058] The inner diameter of the first cavity outlet channel may be at least twice the inner diameter of the downstream portion of the second cavity outlet channel. The inner diameter of the main outlet channel may at be least twice the inner diameter of the downstream portion of the second cavity outlet channel.

[0059] A cross-sectional area of the downstream portion of the second cavity outlet channel may be less than a cross-sectional area of the first cavity outlet channel.

[0060] The cross-sectional area of the downstream portion of the second cavity outlet channel may be at least 50 percent less than a cross-sectional area of the first cavity outlet channel. The cross-sectional area of the downstream portion of the first cavity outlet channel may be at least twice, or at least three times, or at least four times, the cross-sectional area of the second cavity outlet channel.

[0061] The first cavity and the second cavity may be identically shaped. The first cavity and the second cavity may be identically sized. The first cavity and the second cavity may be differently shaped. The first cavity and the second cavity may be differently sized. For example, the first cavity and the second cavity may have the same width and the same height, but a different length. The inner volume of the first cavity may exceed the inner volume of the second cavity, for example by at least 30 percent.

[0062] The aerosol-generating device may comprise a mixing chamber. The mixing chamber may be arranged downstream of the first and second cavities in the airflow path. The mixing chamber may be part of the main outlet channel. The mixing chamber may be configured to mix substances released from the first and second cavities. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0063] -9-

[0064] The mixing chamber may assist in mixing and homogenization of substances released from the first and second aerosol-generating articles. A more consistent flavor profile may be achieved. Nucleation may be improved by the mixing chamber. Aerosol quality may be improved by the mixing chamber.

[0065] The first heater assembly may comprise a heating element. The second heater assembly may comprise a heating element. The heating element may be an inductive heating element. The heating element may be a resistive heating element. The heating element may comprise an electrically conductive track on an electrically insulating substrate. The heating element may be a coil and wick arrangement.

[0066] The first heater assembly may comprise two heating elements arranged on opposing sides of the first cavity. The second heater assembly may comprise two heating elements arranged on opposing sides of the second cavity.

[0067] The aerosol-generating device may comprise a first valve means for controlling airflow through the first cavity. The aerosol-generating device may comprise a second valve means for controlling airflow through the second cavity. The controller may be operable to selectively open and close the valve means.

[0068] The aerosol-generating device may comprise a housing. The housing may comprise a mouthpiece. The mixing chamber may be provided in the mouthpiece.

[0069] The housing may comprise a main body. The main body may comprise the first and second cavities. The main body may comprise the first and second heater assemblies. The main body may comprise a controller. The main body may comprise a power source. The power source may be a battery.

[0070] The mouthpiece may be releasably attached to the main body. The mouthpiece may be replaceable.

[0071] The housing may comprise a metal or an alloy. The housing may comprise one or more of aluminium, anodised aluminium, titanium, and stainless steel. The housing may comprise a plastic material. The housing may comprise one or more of polycarbonate (PC), acrylonitrile butadiene styrene (ABS), PC / ABS, and polypropylene (PP).

[0072] According to an embodiment of the invention there is provided an aerosol-generating system. The aerosol-generating system comprises an aerosol-generating device as disclosed herein. The aerosol-generating system comprises a first aerosol-generating article comprising a first aerosol-forming substrate. The aerosol-generating system comprises a second aerosolgenerating article comprising a second aerosol-forming substrate.

[0073] The first aerosol-forming substrate may be chemically different from the second aerosol-forming substrate. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0074] -10-

[0075] The first aerosol-forming substrate may comprise nicotine. The second aerosol-forming substrate may comprise a flavorant. The second aerosol-forming substrate may be nicotine- free.

[0076] One or both of the first aerosol-forming substrate and the second aerosol-forming substrate may comprise one or more of the following: tobacco, hybrid botanicals, CBD, THC, nicotine, humectant. One or both of the first aerosol-forming substrate and the second aerosolforming substrate may be impregnated with a sensorial media such as a liquid or gel containing nicotine and / or flavorants and / or other pharmacologically active compounds.

[0077] One or both of the first aerosol-forming substrate and the second aerosol-forming substrate may hold their respective compounds within an aerosol-generating humectant, including propylene glycol, water, glycerol, or combination thereof, which may then be held in free space such as a hermetically sealed reservoir, or deposited onto a substrate made from tobacco, cotton, non-woven, paper, or otherwise.

[0078] The first aerosol-forming substrate may be a sensorial media aerosol-forming substrate. The second aerosol-forming substrate may be a flavor-generating substrate.

[0079] According to an embodiment of the invention there is provided a method for operating an aerosol-generating system. The method comprises providing an aerosol-generating system as disclosed herein. The method comprises activating the first heater assembly to heat the first aerosol-generating article in the first cavity for a plurality of puffs of a user session. The method may comprise activating the second heater assembly to heat the second aerosol-generating article in the second cavity for at least one of the plurality of puffs of the user session, such that a ratio of an amount of substances provided to the at least one air outlet from the first cavity to an amount of substances provided to the at least one air outlet from the second cavity varies for at least two different puffs of the user session.

[0080] The method may comprise activating the second heater assembly to heat the second aerosol-generating article in the second cavity for at least one of the plurality of puffs of the user session, such that a ratio of the total mass of substances provided to the at least one air outlet from the first cavity to the total mass of substances provided to the at least one air outlet from the second cavity varies for at least two different puffs of the user session.

[0081] The method may comprise activating both the first heater assembly to heat the first aerosol-generating article in the first cavity and the second heater assembly to heat the second aerosol-generating article in the second cavity for at least one of the plurality of puffs, and activating the first heater assembly to heat the first aerosol-generating article in the first cavity and not activating the second heater for at least another one of the plurality of puffs.

[0082] The first and second aerosol-generating articles each may be an aerosol-generating article as described herein. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0083] -11-

[0084] The aerosol-generating article may be shaped to closely conform to the shape of the respective cavity.

[0085] The aerosol-generating article may have any kind of geometrical shape. For example, the aerosol-generating article may have a round shape, for example a generally spherical shape, for example a pebble or blister-like shape. For example, the aerosol-generating article may have a cuboid shape, for example a planar or flat type shape, for example a generally SD or SIM card-like shape. The respective cavity may have any kind of geometrical shape. For example, the cavity may have a round shape, for example a generally spherical shape, for example a pebble or blister-like shape. For example, the cavity may have a cuboid shape, for example a generally SD or SIM card slot-like shape. The aerosol-generating article and the respective cavity may have corresponding shapes.

[0086] The first aerosol-generating article and the second aerosol-generating article may be identical articles. The first aerosol-generating article and the second aerosol-generating article may be different types of articles. For example, the first aerosol-generating article and the second aerosol-generating article may have different shapes. For example, the first aerosolgenerating article and the second aerosol-generating article may comprise one or both of different types and different amounts of aerosol-forming substrates. The first aerosolgenerating article and the second aerosol-generating article may have identical compositions.

[0087] The first aerosol-forming substrate of the first aerosol-generating article and the second aerosol-forming substrate of the second aerosol-generating article may have different compositions. A user may individualize a user experience by combining different articles with different compositions and flavors as she or he wishes.

[0088] The first and second heater assemblies each may comprise one or more heating elements as described herein.

[0089] The heating element may be a dielectric or capacitive-type heating element. For example, dielectric or capacitive-type heating element can be used having two or more flat or planar electrodes arranged to removably receive an exemplary flat or planar aerosolgenerating article therebetween, interconnected via an impedance matching circuit to an AC source, for generating microwaves between the electrodes for capacitive / dielectric heating.

[0090] The heating element may be a resistive or Joule-type heating element, for example being part of the aerosol-forming device, the exemplary flat or planar aerosol-forming article, or both. The resistive heating element may take any suitable form. For example, the resistive heating element may take the form of one or more flexible heating foils on a dielectric substrate, such as polyimide. The flexible heating foils can be shaped to conform to the perimeter of the respective cavity. Alternatively, a resistive heating element may take the form of a metallic grid or grids, a flexible printed circuit board, a molded interconnect device (MID), ceramic heater, flexible carbon fibre heater or may be formed using a coating technique, such as plasma New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0091] -12- vapour deposition, on a suitable shaped substrate. A resistive heating element may also be formed using a metal having a defined relationship between temperature and resistivity. In such an exemplary device, the metal may be formed as a track between two layers of suitable insulating materials. A resistive heating element formed in this manner may be used to both heat and monitor the temperature of the resistive heating element during operation. It is also possible that the resistive heating elements are part of the aerosol-forming article, for example a flat or planar aerosol-forming article, for example but not limited to a plate-like shape or having electrically resistive tracks arranged on a flat heater substrate, for example as described in W02016 / 005530 and WO2016 / 005533, showing a cartridge with integrated heating elements, these references herewith incorporated by reference in their entirety.

[0092] The heating element may be a radiation-based heating element, for example but not limited to a semiconductor based heating element, having an array of individual radiationbased heating elements, for example as shown in WO2017 / 182249, this reference incorporated by reference in its entirety.

[0093] The radiation-based heating element may a non-contact heater, for example as shown in WO2022 / 207447, this reference incorporated by reference in its entirety.

[0094] The radiation-based heating element may comprise a radiation source that can radiate onto a surface or layer of a flat aerosol-forming article to cause aerosolization or vaporization. The radiation source may be configured to emit electromagnetic radiation. The electromagnetic radiation may be microwaves, far infrared, infrared, near infrared, or visible light.

[0095] The radiation source may be a photonic device or laser irradiation device. The photonic device may be a light-emitting diode (LED). The radiation source may be a perovskite LED.

[0096] The photonic device may be a thin film that can irradiate electromagnetic radiation, preferably infrared radiation.

[0097] The radiation source may comprise an infrared radiating coating, for example an NiCr2O4 powder coating or other high-emissivity ceramic coating that can emit infrared light.

[0098] The heating element may be an induction heating element. The induction heating element may comprise one or more induction coils which each may surround the respective cavity. For example, a helical induction coil may extend around the first and second major boundary surfaces of a cavity. The longitudinal axis of the or each induction coil may be substantially parallel to the principal flow axis. For example, the heating element can be configured to have planar coils configured for inductively heating a flat susceptor inside, outside, or in contact with the aerosol-forming substrate of the flat or planar aerosol-forming article, for example as described in WO2015 / 177043 or WO2015 / 177044, these references herewith incorporate by reference in their entirety. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0099] -13-

[0100] As used herein, the term “longitudinal axis” in respect of an induction coil refers to an axis extending through the centre of the coil in a direction generally perpendicular to the turns of the coil.

[0101] The induction heating element may be arranged to inductively heat a susceptor. The induction heating element may comprise one or more induction coils located adjacent the first and / or second major boundary surface of a respective cavity. The longitudinal axis of the or each induction coil may be substantially perpendicular to the principal flow axis, for example and to a plane defined by the first major boundary surface.

[0102] The one or more induction coils may be planar. For example, a planar induction coil may be located adjacent and in parallel to one of the first and second major boundary surfaces of a respective cavity. For example, a first planar induction coil may be located adjacent and in parallel to the first major boundary surface and a second planar induction coil may be located adjacent and in parallel to the second major boundary surface.

[0103] The susceptor may be part of an aerosol-generating article within the cavity. The susceptor may be part of the aerosol-generating device. For example, the susceptor may be arranged on an inner side of the cavity. For example, one or both of the first and second major boundary surfaces of a respective cavity may comprise a susceptor material.

[0104] In use, a susceptor may be inductively heated by the or each induction coil. The susceptor then, in turn, conductively, convectively and / or radiatively heats the aerosol-forming substrate located in proximity to the susceptor.

[0105] A ‘susceptor’ refers to an element that heats up when subjected to a varying or alternating magnetic field. Usually, a susceptor is conductive, and heating of the susceptor is the result of eddy currents being induced in the susceptor or hysteresis losses. Both hysteresis losses and eddy currents can occur in a susceptor. A susceptor may include graphite, molybdenum, silicon carbide, stainless steels, niobium, aluminium and any other conductive elements. Preferably, the susceptor element is a ferrite element. The material and the geometry for the susceptor may be chosen to provide a desired electrical resistance and heat generation.

[0106] In the operation of an induction heater, a high frequency alternating current is passed through one or more induction coils to generate one or more corresponding alternating magnetic fields that induce a voltage in a susceptor of an article. The induced voltage causes a current to flow in the susceptor and this current causes Joule heating of the susceptor that in turn heats the aerosol-forming substrate. If the susceptor is ferromagnetic, hysteresis losses in the susceptor may also generate heat.

[0107] The term ‘high frequency’ denotes a frequency ranging from about 500 Kilohertz (KHz) to about 30 Megahertz (MHz) (including the range of 500 KHz to 30 MHz), in particular from about 1 Megahertz (MHz) to about 10 MHz (including the range of 1 MHz to 10 MHz), and New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0108] -14- even more particularly from about 5 Megahertz (MHz) to about 7 Megahertz (MHz) (including the range of 5 MHz to 7 MHz).

[0109] Throughout the present disclosure, the term ‘magnetic field’ may refer to a varying or alternating magnetic field.

[0110] Throughout the present disclosure, the term ‘current’ may refer to an alternating current.

[0111] The heating element may be configured or configurable to heat an article received in the cavity to a temperature less than 400 degrees centigrade, for example less than 300 degrees centigrade, say less than 270 degrees centigrade. In some embodiments, the heater may be configured or configurable to heat an article for forming an aerosol received in the heating chamber to a temperature less than 250, 225, 200, 175 or 150 degrees centigrade, for example less than 140, 130, 120, 110, 100 or 90 degrees centigrade.

[0112] The aerosol-generating device may comprise electric circuitry. The electric circuitry may comprise a microprocessor, which may be a programmable microprocessor. The microprocessor may be part of a controller. The electric circuitry may comprise further electronic components. The electric circuitry may be configured to regulate a supply of power to the heating element. Power may be supplied to the heating element continuously following activation of the aerosol-generating device or may be supplied intermittently, such as on a puff- by-puff basis. The power may be supplied to the heating element in the form of pulses of electrical current. The electric circuitry may be configured to monitor the electrical resistance of the heating element, and preferably to control the supply of power to the heating element dependent on the electrical resistance of the heating element.

[0113] The aerosol-generating device may comprise a power source or power supply, typically a battery, within a main body of the aerosol-generating device. In one embodiment, the power supply is a Lithium-ion battery. Alternatively, the power supply may be a Nickel-metal hydride battery, a Nickel cadmium battery, or a Lithium based battery, for example a Lithium-Cobalt, a Lithium-lron-Phosphate, Lithium Titanate or a Lithium-Polymer battery. As an alternative, the power supply may be another form of charge storage device such as a capacitor. The power supply may require recharging and may have a capacity that enables to store enough energy for one or more usage experiences; for example, the power supply may have sufficient capacity to continuously generate aerosol for a period of around six minutes or for a period of a multiple of six minutes. In another example, the power supply may have sufficient capacity to provide a predetermined number of puffs or discrete activations of the heating element.

[0114] As used herein, the term “aerosol-forming substrate” refers to a substrate capable of releasing volatile compounds that can form an aerosol. Such volatile compounds may be released by heating the aerosol-forming substrate. The aerosol-forming substrate may be in solid form or may be in liquid form. The aerosol-forming substrate may be solid or liquid or may New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0115] -15- comprise both solid and liquid components. An aerosol-forming substrate may be part of an aerosol-generating article. The terms ‘aerosol’ and ‘vapor’ are used synonymously.

[0116] The aerosol-forming substrate may comprise a pharmaceutically active compound. The aerosol-forming substrate may comprise one or more of: tobacco, nicotine, a gel composition and a flavour agent. The aerosol-forming substrate may comprise nicotine.

[0117] The aerosol-forming substrate may comprise one or more of botanicals, botanical drugs, and pharmaceutical ingredients. The one or more of botanicals, botanical drugs, and pharmaceutical ingredients may be part of an aerosol-forming substrate that can be at least partially aerosolized with an aerosol former for inhalation. The aerosol-forming substrate may comprise one or more of botanicals, botanical drugs, and pharmaceutical ingredients, wherein the substrate has an aerosol former content of between 5% and 30% by weight on a dry weight basis.

[0118] Preferably, the aerosol-forming substrate comprises plant material and an aerosol former. Preferably, the plant material is a plant material comprising an alkaloid, more preferably a plant material comprising nicotine, and more preferably a tobacco-containing material.

[0119] Preferably, the aerosol-forming substrate comprises at least 70 percent of plant material, more preferably at least 90 percent of plant material by weight on a dry weight basis. Preferably, the aerosol-forming substrate comprises less than 95 percent of plant material by weight on a dry weight basis, such as from 90 to 95 percent of plant material by weight on a dry weight basis.

[0120] Preferably, the aerosol-forming substrate comprises at least 5 percent of aerosol former, more preferably at least 10 percent of aerosol former by weight on a dry weight basis. Preferably, the aerosol-forming substrate comprises less than 30 percent of aerosol former by weight on a dry weight basis, such as from 5 to 30 percent of aerosol former by weight on a dry weight basis.

[0121] In some particularly preferred embodiments, the aerosol-forming substrate comprises plant material and an aerosol former, wherein the substrate has an aerosol former content of between 5% and 30% by weight on a dry weight basis. The plant material is preferably a plant material comprising an alkaloid, more preferably a plant material comprising nicotine, and more preferably a tobacco-containing material. Alkaloids are a class of naturally occurring nitrogencontaining organic compounds. Alkaloids are found mostly in plants, but are also found in bacteria, fungi and animals. Examples of alkaloids include, but are not limited to, caffeine, nicotine, theobromine, atropine and tubocurarine. A preferred alkaloid is nicotine, which may be found in tobacco.

[0122] An aerosol-forming substrate may comprise nicotine. An aerosol-forming substrate may comprise tobacco, for example may comprise a tobacco-containing material containing volatile tobacco flavour compounds, which are released from the aerosol-forming substrate New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0123] -16- upon heating. In preferred embodiments an aerosol-forming substrate may comprise homogenised tobacco material, for example cast leaf tobacco. The aerosol-forming substrate may comprise both solid and liquid components. The aerosol-forming substrate may comprise a tobacco-containing material containing volatile tobacco flavour compounds, which are released from the substrate upon heating. The aerosol-forming substrate may comprise a nontobacco material. The aerosol-forming substrate may further comprise an aerosol former. Examples of suitable aerosol formers are glycerine and propylene glycol.

[0124] As used herein, the term “tobacco material” is used to describe any material comprising tobacco, including, but not limited to, tobacco leaf, tobacco rib, tobacco stem, tobacco stalk, tobacco dust, expanded tobacco, reconstituted tobacco material and homogenised tobacco material.

[0125] As used herein, the term “homogenised tobacco” denotes a material formed by agglomerating particulate tobacco. Homogenized tobacco may include reconstituted tobacco or cast leaf tobacco, or a mixture of both. The term “reconstituted tobacco” refers to paperlike material that can be made from tobacco by-products, such as tobacco fines, tobacco dusts, tobacco stems, or a mixture of the foregoing. Reconstituted tobacco can be made by extracting the soluble chemicals in the tobacco by-products, processing the leftover tobacco fibers into a sheet, and then reapplying the extracted materials in concentrated form onto the sheet.

[0126] The term “cast leaf” is used herein to refer to a sheet product made by a casting process that is based on casting a slurry comprising plant particles (for example, clove particles, or tobacco particles and clove particles in a mixture) and a binder (for example, guar gum) onto a supportive surface, such as a belt conveyor, drying the slurry and removing the dried sheet from the supportive surface. An example of the casting or cast leaf process is described in, for example- in U.S. Patent No. 5,724,998 for making cast leaf tobacco, this reference herewith incorporated by reference in its entirety. In a cast leaf process, particulate plant materials are mixed with a liquid component, typically water, to form a slurry. Other added components in the slurry may include fibres, a binder and an aerosol former. The particulate plant materials may be agglomerated in the presence of the binder. The slurry is cast onto a supportive surface and dried to form a sheet of homogenised plant material.

[0127] The aerosol-forming substrate may comprise one or more flavourants. As used herein, the term "flavourant" refers to a composition having organoleptic properties, which provide a sensory experience to the user, for example to enhance the flavour of aerosol. A flavourant can be used to deliver a gustatory sensation (taste), an olfactory sensation (smell), or both a gustatory and an olfactory sensation to the user, for example when inhaling the aerosol.

[0128] As used herein, the term “aerosol-generating article” refers to an article comprising an aerosol-forming substrate that is capable of releasing volatile compounds that can form an aerosol. An aerosol-generating article may be disposable. An aerosol-generating article New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0129] -17- comprising an aerosol-forming substrate comprising tobacco may be referred to herein as a tobacco stick.

[0130] As used herein, the term “aerosol-generating device” refers to a device that interacts with an aerosol-forming substrate to generate an aerosol. An aerosol-generating device may interact with one or both of an aerosol-generating article comprising an aerosol-forming substrate, and a cartridge comprising an aerosol-forming substrate. In some examples, the aerosol-generating device may heat the aerosol-forming substrate to facilitate release of volatile compounds from the substrate. An electrically operated aerosol-generating device may comprise an atomiser, such as an electric heater, to heat the aerosol-forming substrate to form an aerosol.

[0131] The first and second heater cavities each are a cavity as described herein. The cavity may be configured as a heating chamber. The cavity may have a cylindrical shape. The cavity may have a hollow cylindrical shape. The cavity may have a shape corresponding to the shape of the aerosol-generating article to be received in the cavity. The cavity may have a circular cross-section. The cavity may have an elliptical or rectangular cross-section. The cavity may have an inner diameter corresponding to the outer diameter of the aerosol-generating article.

[0132] As used herein, the term "aerosol-generating system" refers to the combination of an aerosol-generating device with an aerosol-forming substrate. When the aerosol-forming substrate forms part of an aerosol-generating article, the aerosol-generating system refers to the combination of the aerosol-generating device with the aerosol-generating article. In the aerosol-generating system, the aerosol-forming substrate and the aerosol-generating device cooperate to generate an aerosol.

[0133] As used herein, the terms ‘proximal’, ‘distal’, ‘downstream’ and ‘upstream’ are used to describe the relative positions of components, or portions of components, of the aerosolgenerating device and the aerosol-generating article in relation to the direction in which a user draws on the aerosol-generating device or aerosol-generating article during use thereof.

[0134] The aerosol-generating device may comprise a mouth end through which in use an aerosol exits the aerosol-generating device and is delivered to a user. In use, a user draws on the proximal or mouth end of the aerosol-generating device in order to inhale an aerosol generated by the aerosol-generating device. The aerosol-generating device comprises a distal end opposed to the proximal or mouth end. The proximal or mouth end of the aerosolgenerating device may also be referred to as the downstream end and the distal end of the aerosol-generating device may also be referred to as the upstream end. Components, or portions of components, of the aerosol-generating device may be described as being upstream or downstream of one another based on their relative positions between the proximal, downstream or mouth end and the distal or upstream end of the aerosol-generating device. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0135] -18-

[0136] Below, there is provided a non-exhaustive list of non-limiting examples. Any one or more of the features of these examples may be combined with any one or more features of another example, embodiment, or aspect described herein.

[0137] Example E1 : An aerosol-generating device comprising a first cavity for receiving a first aerosol-generating article; a first heater assembly configured for heating the first aerosol-generating article in the first cavity; a second cavity for receiving a second aerosol-generating article; a second heater assembly configured for heating the second aerosol-generating article in the second cavity; and an airflow path extending between at least one air inlet and at least one air outlet of the device, wherein the first cavity and the second cavity are arranged in the airflow path.

[0138] Example E2: The aerosol-generating device according to Example E1 , wherein the device is configured to provide, for different puffs of a user session, different amounts of substance released from the second cavity to the at least one air outlet.

[0139] Example E3: The aerosol-generating device according to Example E1 or Example E2, wherein the device is configured to vary, for different puffs of a user session, a ratio of an amount of substances provided to the at least one air outlet from the first cavity to an amount of substances provided to the at least one air outlet from the second cavity.

[0140] Example E4: The aerosol-generating device according to any of the preceding examples, wherein the device is configured such that heating of the first and second cavities is individually controllable.

[0141] Example E5: The aerosol-generating device according to any of the preceding examples, wherein the device is configured such that the first and second heater assemblies are individually controllable.

[0142] Example E6: The aerosol-generating device according to Example E5, wherein the device is configured to apply a different activation profile of the first heater assembly compared to the second heater assembly over a plurality of puffs of a user session.

[0143] Example E7: The aerosol-generating device according to Example E5 or Example E6, wherein the device is configured to activate heating of the second heater assembly for at least one of the plurality of puffs of a user session, and to inactivate or reduce heating of the second heater assembly for at least another one of the plurality of puffs of the user session.

[0144] Example E8: The aerosol-generating device according to any of Examples E5 to E7, wherein the device is configured to activate heating of the first heater assembly for each of the plurality of puffs of the user session.

[0145] Example E9: The aerosol-generating device according to any of Examples E5 to E8, wherein the device is configured to activate or inactivate or reduce heating of the second heater New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0146] -19- assembly for at least one of the plurality of puffs of the user session based on a signal received from a sensor and / or a decision-making routine.

[0147] Example E10: The aerosol-generating device according to any of Example E5 to E9, wherein the device is configured to activate or inactivate or reduce heating of the second heater assembly for at least one of the plurality of puffs of the user session based on a predetermined heating scheme for the user session.

[0148] Example E11 : The aerosol-generating device according to Example E10, wherein the device is configured to activate heating of the second heater assembly for one or more initial puffs of the user session, optionally, wherein the one or more initial puffs are the first puff, the first and second puffs, the first to third puffs, the first to fourth puffs, or the first to fifth puffs of the user session.

[0149] Example E12: The aerosol-generating device according to Example E10 or Example E11 , wherein the device is configured to alternatingly activate heating of the second heater assembly and inactivate or reduce heating of the second heater assembly for a sequence of consecutive puffs of the plurality of puffs of the user session.

[0150] Example E13: The aerosol-generating device according to any of the preceding examples, wherein the first cavity and the second cavity are arranged in parallel in the airflow path.

[0151] Example E14: The aerosol-generating device according to Example E13, comprising a holding chamber arranged downstream of the second cavity and in parallel to the first cavity in the airflow path.

[0152] Example E15: The aerosol-generating device according to Example E13, comprising a main outlet channel extending in the airflow path to the at least one air outlet; a first cavity outlet channel extending in the airflow path from the first cavity to the main outlet channel; and a second cavity outlet channel extending in the airflow path from the second cavity to the main outlet channel.

[0153] Example E16: The aerosol-generating device according to Example E15, wherein the second cavity outlet channel comprises a holding chamber arranged between an upstream portion and a downstream portion of the second cavity outlet channel.

[0154] Example E17: The aerosol-generating device according to Example E16, wherein a cross-sectional area of the downstream portion of the second cavity outlet channel is less than a cross-sectional area of the first cavity outlet channel.

[0155] Example E18: The aerosol-generating device according to Example E17, wherein the cross-sectional area of the downstream portion of the second cavity outlet channel is at least 50 percent less than a cross-sectional area of the first cavity outlet channel. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0156] -20-

[0157] Example E19: The aerosol-generating device according to any of the preceding examples, wherein the first cavity and the second cavity are one or both of differently shaped and differently sized.

[0158] Example E20: The aerosol-generating device according to any of the preceding examples, comprising a mixing chamber arranged downstream of the first and second cavities in the airflow path and configured to mix substances released from the first and second cavities.

[0159] Example E21 : The aerosol-generating device according to any of the preceding examples, wherein the first heater assembly comprises two heating elements arranged on opposing sides of the first cavity, and wherein the second heater assembly comprises two heating elements arranged on opposing sides of the second cavity.

[0160] Example E22: The aerosol-generating device according to any of the preceding examples, comprising one or both of a first valve means for controlling airflow through the first cavity and a second valve means for controlling airflow through the second cavity.

[0161] Example E23: An aerosol-generating system comprising an aerosol-generating device according to any of the preceding examples; a first aerosol-generating article comprising a first aerosol-forming substrate; and a second aerosol-generating article comprising a second aerosol-forming substrate.

[0162] Example E24: The aerosol-generating system according to Example E23, wherein the first aerosol-forming substrate is chemically different from the second aerosol-forming substrate.

[0163] Example E25: The aerosol-generating system according to Example E24, wherein the first aerosol-forming substrate comprises nicotine and the second aerosol-forming substrate comprises a flavorant, preferably wherein the second aerosol-forming substrate is nicotine- free.

[0164] Example E26: The aerosol-generating system according to Example E24 or Example E25, wherein the first aerosol-forming substrate is a sensorial media aerosol-forming substrate and the second aerosol-forming substrate is a flavor-generating substrate.

[0165] Example E27: A method for operating an aerosol-generating system, the method comprising providing an aerosol-generating system according to any of Examples E23 to E26; activating the first heater assembly to heat the first aerosol-generating article in the first cavity for a plurality of puffs of a user session; and activating the second heater assembly to heat the second aerosol-generating article in the second cavity for at least one of the plurality of puffs of the user session, such that a ratio of an amount of substances provided to the at least one air outlet from the first cavity to an New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0166] -21- amount of substances provided to the at least one air outlet from the second cavity varies for at least two different puffs of the user session.

[0167] Features described in relation to one embodiment may equally be applied to other embodiments of the invention.

[0168] The invention will be further described, by way of example only, with reference to the accompanying drawings in which:

[0169] Fig. 1a shows an aerosol-generating device;

[0170] Fig. 1b shows an operating scheme for an aerosol-generating device;

[0171] Fig. 2a shows an aerosol-generating device; and

[0172] Fig. 2b shows an operating scheme for an aerosol-generating device.

[0173] Fig. 1a schematically shows an aerosol-generating device in a cross-sectional view. The aerosol-generating device comprises a first cavity 10 for receiving a first aerosolgenerating article (not shown). The aerosol-generating device comprises a first heater assembly 12 configured for heating the first aerosol-generating article in the first cavity 10. The aerosol-generating device comprises a second cavity 14 for receiving a second aerosolgenerating article (not shown). The aerosol-generating device comprises a second heater assembly 16 configured for heating the second aerosol-generating article in the second cavity 14. Each heater assembly 12, 16 may comprise two heating elements arranged on opposing sides of the respective cavity 10, 14.

[0174] The aerosol-generating device comprises an airflow path extending between at least one air inlet (not shown) and at least one air outlet 18 of the device. An inlet portion of the airflow path (not shown) may extend between at least on air inlet and an upstream end of each of the first and second cavities 10, 14 to allow an inlet airflow of air to enter the cavities 10, 14.

[0175] The first cavity 10 and the second cavity 14 are arranged in the airflow path. The first cavity 10 and the second cavity 14 are arranged in parallel in the airflow path.

[0176] During use, a first enriched airflow 20 comprising volatized compounds stemming from the first aerosol-generating article exits the first cavity 10 via a first cavity outlet channel 22. A second enriched airflow 24 comprising volatized compounds stemming from the second aerosol-generating article exits the second cavity 14 via a second cavity outlet channel 26.

[0177] The aerosol-generating device comprises a mixing chamber 28. The mixing chamber 28 is arranged downstream of the first and second cavities 10, 14 in the airflow path. The first cavity outlet channel 22 fluidly connects a downstream end of the first cavity 10 to an upstream end of the mixing chamber 28. The second cavity outlet channel 26 fluidly connects a downstream end of the second cavity 14 to the upstream end of the mixing chamber 28. The New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0178] -22- mixing chamber 28 is configured to mix substances released from the first and second cavities 10, 14.

[0179] During use, the first enriched airflow 20 and the second enriched airflow 24 are mixed in the mixing chamber 28 and a mixed airflow is transported from a downstream end of the mixing chamber 28 to the air outlet 18, where it may be inhaled by a user.

[0180] The device is configured to vary, for different puffs of a user session, a ratio of an amount of substances provided to the at least one air outlet 18 from the first cavity 10 to an amount of substances provided to the at least one air outlet from the second cavity 14.

[0181] The aerosol-generating device may further comprise a controller 30 and a battery 32.

[0182] The aerosol-generating device may comprise a mouthpiece 34 and a main body 36. The mixing chamber 28 may form part of the mouthpiece. The first and second cavities 10, 14 may form part of the main body 36. The mouthpiece 34 may be releasably attached to the main body 36. Thereby, a user may replace the mouthpiece 34.

[0183] The aerosol-generating device may provide a more constant flavour experienced by a user throughout a user session comprising a plurality of puffs. For example, the aerosolgenerating device may be operated as follows. At the beginning of a user session, both cavities 10, 14 are heated at their appropriate optimal temperature profile by the first and second heater assemblies 12, 16, respectively. After a predefined number of puffs, preferably, 3, 4 to 5, the second enriched airflow 24 is released.

[0184] For example, during the first initial puffs of a user session, the temperature within the second cavity 14 may rise from puff to puff. Different types of second aerosol-generating articles may comprise different aerosol-forming substrates with different flavor-release temperatures. The term “flavor release temperature” may refer to a minimum temperature at which an aerosol-forming substrate releases significant amounts of flavor to the airflow. For example, a specific type of second aerosol-generating article may comprise an aerosol-forming substrate with a specific flavor release temperature which is reached after a heating time corresponding to approximately the duration of the first two puffs of a user session, such that the second enriched airflow 24 is released after the first two puffs. For example, another specific type of second aerosol-generating article may comprise an aerosol-forming substrate with a higher specific flavor release temperature which is reached only after a longer heating time corresponding to approximately the duration of the first four puffs of a user session, such that the second enriched airflow 24 is released after the first four puffs. It must be appreciated that the aerosol-generating device may be adapted to recognize a type of a consumable that is used. Those skilled in the art shall appreciate that various technical means can be used to implement this functionality - from optical sensors cooperating with suitable marking on a consumable to electrical means, such as, for example, impedance measurements in the consumable, or the like. New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0185] -23-

[0186] Following this, the device may be set to deliver the second enriched airflow 24 at alternate, preferably, pre-defined intervals. The progressive release of the second enriched airflow 24 may prolong the flavor intensity and may prevent the intensity decreasing as the aerosol is released. A more satisfying and consistent user experience may be achieved.

[0187] Fig. 1 b is a diagram showing an operational mode that can be used in the aerosolgenerating device of Fig. 1a. Fig. 1 b plots the composition of the mixed airflow at the air outlet 18 (y axis) versus the number of a puff (x axis) of a user session comprising, in this example, 12 puffs.

[0188] For each puff, the mixed airflow comprises an amount of the first enriched airflow 20 and an amount of the second enriched airflow 24. However, the composition of the mixed airflow varies between puffs. In the first five puffs, there is a constant ratio of the amount of the first enriched airflow 20 to the amount of the second enriched airflow 24 of about 1 to 1 . In the sixth, eighth, tenth and twelfth puffs, the mixed airflow comprises only the first enriched airflow 20. This means that the amount of volatized compounds from the first aerosol-generating article provided by the first enriched airflow 20 has doubled and the amount of volatized compounds from the second aerosol-generating article provided by the second enriched airflow 24 is zero or near zero during those puffs. In the seventh, nineth, and eleventh puffs, the ratio of the amount of the first enriched airflow 20 to the amount of the second enriched airflow 24 is about 1 to 1.

[0189] During a user session according to the operational mode of Fig. 1b, both the first and second enriched airflows 20, 24 are simultaneously released during the initial puffs, preferably the first five puffs as shown in Fig. 1b. This may be achieved by simultaneously heating both aerosol-generating articles received in the first and second cavities 10, 14 by means of the first and second heater assemblies 12, 16. This may allow an equal amount of enriched first and second airflows 20, 24 to be present within mixing chamber 28.

[0190] This may initially provide a strong flavor perception for the user. Flavorings may bind to the receptors on the taste receptor cells of the user. Following this, the aerosol-generating device may be set via controller 30 to deliver the second enriched airflow 24 at non-successive intervals, which may be >1. In the embodiment shown in Fig. 1b, the intervals are 2, meaning that the second enriched airflow 24 is delivered only every second puff.

[0191] By temporarily interrupting flavorants provided by the second enriched airflow 24, taste receptors of a user may remain sensitive and not become oversaturated due to excessive exposure to high levels of flavorants. A high level of taste sensitivity of a user may thereby be maintained throughout a user session.

[0192] Fig. 2a schematically shows an aerosol-generating device in a cross-sectional view. The aerosol-generating device comprises a first cavity 10 for receiving a first aerosolgenerating article (not shown). The aerosol-generating device comprises a first heater New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0193] -24- assembly 12 configured for heating the first aerosol-generating article in the first cavity 10. The aerosol-generating device comprises a second cavity 14 for receiving a second aerosolgenerating article (not shown). The aerosol-generating device comprises a second heater assembly 16 configured for heating the second aerosol-generating article in the second cavity 14. Each heater assembly 12, 16 may comprise two heating elements arranged on opposing sides of the respective cavity 10, 14.

[0194] The aerosol-generating device comprises an airflow path extending between at least one air inlet (not shown) and at least one air outlet 18 of the device. An inlet portion of the airflow path (not shown) may extend between at least on air inlet and an upstream end of each of the first and second cavities 10, 14 to allow an inlet airflow of air to enter the cavities 10, 14.

[0195] The first cavity 10 and the second cavity 14 are arranged in the airflow path. The first cavity 10 and the second cavity 14 are arranged in parallel in the airflow path.

[0196] During use, a first enriched airflow 20 comprising volatized compounds stemming from the first aerosol-generating article exits the first cavity 10 via a first cavity outlet channel 22. A second enriched airflow 24 comprising volatized compounds stemming from the second aerosol-generating article exits the second cavity 14 via a second cavity outlet channel 26.

[0197] The second cavity outlet channel 26 comprises an upstream portion 38, a holding chamber 40, and a downstream portion 42.

[0198] The first and second cavity outlet channels 22, 26 are arranged in parallel and merge at their downstream ends into a main outlet channel 44. During use, the first enriched airflow 20 and the second enriched airflow 24 are mixed in the main outlet channel 44 and the mixed airflow is transported to the air outlet 18 where it may be inhaled by a user.

[0199] The holding chamber 40 may function as a stage gate for release of the second enriched airflow 24 to the main outlet channel 44 in which the first enriched airflow 20 and the second enriched airflow 24 meet and homogenize.

[0200] The aerosol-generating device may comprise a mixing chamber (not shown) arranged along the main outlet channel 44.

[0201] The device is configured to vary, for different puffs of a user session, a ratio of an amount of substances provided to the at least one air outlet 18 from the first cavity 10 to an amount of substances provided to the at least one air outlet from the second cavity 14.

[0202] The aerosol-generating device may further comprise a controller 30 and a battery 32.

[0203] The aerosol-generating device may comprise a mouthpiece 34 and a main body 36. The first and second cavities 10, 14 may form part of the main body 36. The mouthpiece 34 may be releasably attached to the main body 36. Thereby, a user may replace the mouthpiece 34.

[0204] During use, the second heater assembly may be energized to heat the second cavity 14 only at periodic intervals, for example only every second puff, such that a second enriched New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT

[0205] -25- airflow 24 is produced from the second aerosol-generating article only at those periodic intervals. Thus, a user may receive the full dose of flavored aerosol only during those particular puffs. By the presence of the holding chamber 40, an amount of the second enriched airflow 24 may be pulled out of the holding chamber 40 into the main outlet channel 44 and thereby supplied to the mixed airflow also during those puffs where no second enriched airflow 24 is produced from the second aerosol-generating article. By means of the holding chamber, a more consistent dosage delivery of flavored aerosol to the user may be provided, in each puff, as opposed to only during the periodic puffs.

[0206] Fig. 2b is a diagram showing an operational mode that can be used in the aerosolgenerating device of Fig. 2a. Fig. 2b plots the composition of the mixed airflow at the air outlet 18 (y axis) versus the number of a puff (x axis) of a user session comprising, in this example, 12 puffs.

[0207] For each puff, the mixed airflow comprises an amount of the first enriched airflow 20 and an amount of the second enriched airflow 24. However, the composition of the mixed airflow varies between puffs. In the first five puffs, there is a constant ratio of the amount of the first enriched airflow 20 to the amount of the second enriched airflow 24 of roughly 2 to 1. In the following three puffs 6 to 8, there is a constant ratio of the amount of the first enriched airflow 20 to the amount of the second enriched airflow 24 of roughly 5 to 1 . In puff number 9, there is a ratio of the amount of the first enriched airflow 20 to the amount of the second enriched airflow 24 of roughly 2 to 1. In the final three puffs 9 to 12, there is a constant ratio of the amount of the first enriched airflow 20 to the amount of the second enriched airflow 24 of roughly 5 to 1.

[0208] During a user session according to the operational mode of Fig. 2b, both the first and second enriched airflows 20, 24 are simultaneously released to the air outlet 18 during the initial puffs, preferably the first five puffs as shown in Fig. 2b.

[0209] The second aerosol-generating article received in the second cavity 14 is heated periodically by means of the second heater assembly 16. In particular, the second aerosolgenerating article received in the second cavity 14 is heated by means of the second heater assembly 16 during the first five initial puffs and during the nineth puff, but not during the sixth to eighth and tenth to twelfth puffs.

[0210] The second enriched airflow 24 is predominantly held in the holding chamber 40 from which a portion is drawn into the main outlet channel 44 via downstream portion 42 under the influence of vacuum created during user inhalation. The inner diameter of the downstream portion 42 is less (for example by 50% or more) than the inner diameters of the first cavity outlet channel 22 and the main outlet channel 44, such that, during user inhalation, a portion of the second enriched airflow 24 remains in the holding chamber 40, where it can be utilized New PCT Patent Application September 01, 2025 Philip Morris Products S.A. 46073- PCT

[0211] -26- during the next puff. This way, the volume of flavored aerosol delivered is metered and controlled, as illustrated graphically in Fig. 2b.

Claims

New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT-27-CLAIMS1. An aerosol-generating device comprising a first cavity for receiving a first aerosol-generating article; a first heater assembly configured for heating the first aerosol-generating article in the first cavity; a second cavity for receiving a second aerosol-generating article; a second heater assembly configured for heating the second aerosol-generating article in the second cavity; and an airflow path extending between at least one air inlet and at least one air outlet of the device, wherein the first cavity and the second cavity are arranged in the airflow path, wherein the device is programmed to vary, for different puffs of a user session, a ratio of an amount of substances provided to the at least one air outlet from the first cavity to an amount of substances provided to the at least one air outlet from the second cavity by selecting a heating scheme for operating the first heater assembly and the second heater assembly from a database stored on the device.

2. The aerosol-generating device according to claim 1 , wherein the device is configured to provide, for different puffs of a user session, different amounts of substance released from the second cavity to the at least one air outlet.

3. The aerosol-generating device according to claim 1 or claim 2, wherein the device is configured such that the first and second heater assemblies are individually controllable.

4. The aerosol-generating device according to claim 3, wherein the device is configured to apply a different activation profile of the first heater assembly compared to the second heater assembly over a plurality of puffs of a user session.

5. The aerosol-generating device according to claim 3 or claim 4, wherein the device is configured to activate heating of the second heater assembly for at least one of the plurality of puffs of a user session, and to inactivate or reduce heating of the second heater assembly for at least another one of the plurality of puffs of the user session.

6. The aerosol-generating device according to any of claims 3 to 5, wherein the device is configured to activate heating of the first heater assembly for each of the plurality of puffs of the user session.New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT-28-7. The aerosol-generating device according to any of claims 3 to 6, wherein the device is configured to activate or inactivate or reduce heating of the second heater assembly for at least one of the plurality of puffs of the user session based on a signal received from a sensor and / or a decision-making routine.

8. The aerosol-generating device according to any of claims 3 to 7, wherein the device is configured to activate or inactivate or reduce heating of the second heater assembly for at least one of the plurality of puffs of the user session based on a predetermined heating scheme for the user session.

9. The aerosol-generating device according to claim 8, wherein the device is configured to activate heating of the second heater assembly for one or more initial puffs of the user session, optionally, wherein the one or more initial puffs are the first puff, the first and second puffs, the first to third puffs, the first to fourth puffs, or the first to fifth puffs of the user session.

10. The aerosol-generating device according to claim 8 or claim 9, wherein the device is configured to alternatingly activate heating of the second heater assembly and inactivate or reduce heating of the second heater assembly for a sequence of consecutive puffs of the plurality of puffs of the user session.

11. The aerosol-generating device according to any of the preceding claims, wherein the first cavity and the second cavity are arranged in parallel in the airflow path.

12. The aerosol-generating device according to claim 11 , comprising a holding chamber arranged downstream of the second cavity and in parallel to the first cavity in the airflow path.

13. The aerosol-generating device according to claim 11 , comprising a main outlet channel extending in the airflow path to the at least one air outlet; a first cavity outlet channel extending in the airflow path from the first cavity to the main outlet channel; and a second cavity outlet channel extending in the airflow path from the second cavity to the main outlet channel, optionally wherein the second cavity outlet channel comprises a holding chamber arranged between an upstream portion and a downstream portion of the second cavity outlet channel.New PCT Patent Application September 01 , 2025 Philip Morris Products S.A. 46073- PCT-29-14. An aerosol-generating system comprising an aerosol-generating device according to any of the preceding claims; a first aerosol-generating article comprising a first aerosol-forming substrate; and a second aerosol-generating article comprising a second aerosol-forming substrate, wherein the first aerosol-forming substrate is chemically different from the second aerosol-forming substrate.

15. A method for operating an aerosol-generating system, the method comprising providing an aerosol-generating system according to claim 14; activating the first heater assembly to heat the first aerosol-generating article in the first cavity for a plurality of puffs of a user session; and activating the second heater assembly to heat the second aerosol-generating article in the second cavity for at least one of the plurality of puffs of the user session, such that a ratio of an amount of substances provided to the at least one air outlet from the first cavity to an amount of substances provided to the at least one air outlet from the second cavity varies for at least two different puffs of the user session.

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