An aerosol generating substrate element is circumscribed by exactly two paper layers that do not extend beyond an aerosol generating substrate. The aerosol generating substrate includes from about 10% to about 30% glycerine by weight. The first paper wrapper and the second paper wrapper have a combined thickness in a range from about 60 micrometres to about 200 micrometres. The first paper wrapper does not overlap itself and a second paper wrapper does not overlap itself.

An aerosol-generating device (100) for use with an aerosol-generating article comprises a chamber (121) for removably receiving at least a portion of the aerosol-generating article. Along a center axis (122) of the chamber (121), an inner surface (130) of the chamber (121) comprises a first axial portion (131) and a second axial portion (132), wherein the first axial portion (131) is closer to a proximal end (124) of the chamber (121) than the second axial portion (132). The second axial portion (132) is dimpled comprising a plurality of indentations (142), wherein the plurality of indentations (142) extend from a base level area of the second axial portion (142) outwards in a direction away from the center axis (122). The first axial portion (131) comprises a plurality of first protrusions (141), wherein the plurality of first protrusions (141) are configured to contact at least a portion of the aerosol-generating article when the article is received in the chamber (121), and wherein the plurality of first protrusions (141) extend from abase level area of the first axial portion (131) in a direction towards the center axis (122) beyond the base level area of the second axial portion (132).

A non-combustible aerosol provision device for generating an aerosol from an article, comprising an aerosol-generating material, the device including a receptacle to receive, in use, the article; a heating system for heating the aerosol-generating material when the article is received in the receptacle, wherein at least one part of the heating system and the receptacle are relatively movable; a selector operable to select one or more portions of the aerosol-generating material, from a plurality of portions of the aerosol-generating material, for heating by the heating system; and a controller configured to cause at least the part of the heating system to move relative to the receptacle to be positioned such that, in use, the one or more portions of the aerosol-generating material is, or are, heatable by the heating system.

A non-combustible aerosol provision device for generating an aerosol from an article, comprising an aerosol-generating material, the device including a receptacle to receive, in use, the article; a heating system for heating the aerosol-generating material when the article is received in the receptacle, wherein at least one part of the heating system and the receptacle are relatively movable; a selector operable to select one or more portions of the aerosol-generating material, from a plurality of portions of the aerosol-generating material, for heating by the heating system; and a controller configured to cause at least the part of the heating system to move relative to the receptacle to be positioned such that, in use, the one or more portions of the aerosol-generating material is, or are, heatable by the heating system.

An aerosol generating system includes: a cavity configured to accommodate at least a portion of a cigarette; a first induction coil located around the cavity; a second induction coil located around the cavity and connected to the first induction coil in parallel; and a battery configured to supply an alternating current to the first induction coil and the second induction coil, wherein the first induction coil and the second induction coil have different resonant frequencies.

An aerosol generating system includes: a cavity configured to accommodate at least a portion of a cigarette; a first induction coil located around the cavity; a second induction coil located around the cavity and connected to the first induction coil in parallel; and a battery configured to supply an alternating current to the first induction coil and the second induction coil, wherein the first induction coil and the second induction coil have different resonant frequencies.

An aerosol generating device includes: an opening configured to receive a cigarette; an accommodation space configured to accommodate the cigarette inserted through the opening; a coil surrounding the accommodation space and configured to generate an induced magnetic field; a susceptor configured to generate heat due to the induced magnetic field generated from the coil; a heat dissipating structure surrounding the coil and having a double wall structure including a vacuum inner space; and a shielding portion configured to block the induced magnetic field generated from the coil and disposed between the coil and the heat dissipating structure.

An aerosol generating device includes: an opening configured to receive a cigarette; an accommodation space configured to accommodate the cigarette inserted through the opening; a coil surrounding the accommodation space and configured to generate an induced magnetic field; a susceptor configured to generate heat due to the induced magnetic field generated from the coil; a heat dissipating structure surrounding the coil and having a double wall structure including a vacuum inner space; and a shielding portion configured to block the induced magnetic field generated from the coil and disposed between the coil and the heat dissipating structure.

According to some embodiments, an aerosol generating device may include a battery, a first control circuit configured to convert power received from the battery into a pulse width modulation (PWM) signal, a heater configured to heat an aerosol generating article based on the PWM signal received from the first control circuit, and a second control circuit configured to transmit an instruction for causing the first control circuit to generate the PWM signal, in response to a user input to the first control circuit. The first control circuit may determine abnormal operation of the second control circuit, and the second control circuit may determine abnormal operation of the aerosol generating device. Accordingly, the aerosol generating device may determine a more specific operation state and prevent abnormal operation of the heater.

Provided are an aerosol generating device, which discharges visible vapor in a first smoking mode and invisible vapor in a second smoking mode, and an operation method of the aerosol generating device.