Abstract: An aerosol-generating device for heating an aerosol-forming substrate to generate an inhalable aerosol during a usage session is provided, the device including: control electronics; and a lighting array including a plurality of light emitters, the control electronics to independently control each light emitter in an off state in which the light emitter does not emit light, a first lighting state in which the light emitter emits light at a first static luminance level, and a second lighting state in which the light emitter emits light at a second static luminance level that is different from the first level, the control electronics to further control each light emitter to be in one of the off state, the first lighting state, and the second lighting state so as to indicate progression of an operational phase of the device to a user, and the progression of being a progression of the usage session.

Abstract: An aerosol-generating device for generating an aerosol from an aerosol-forming substrate is provided, the aerosol-generating device including a controller configured to control a usage session, to select one of a first criterion and a second criterion different from the first criterion, and to control the usage session with reference to the selected criterion, both the first criterion and the second criterion being criteria selected from the list consisting of volume of aerosol-generated, a combination of time and number of user puffs, a combination of time and volume of aerosol-generated, and a combination of time and a monitored user interaction parameter. A method of operating an aerosol-generating device is also provided.

Abstract: An aerosol-generating device for generating an aerosol from an aerosol-forming substrate is provided, the aerosol-generating device being configured to indicate progress of an event during use of the aerosol-generating device, the aerosol-generating device including: an indicator configured to indicate progress of the event as a sequence of 1st to nth different indication states, n being a number equal to or greater than 7; and a controller configured to monitor progress of the event and to control the indicator to indicate in an indication state representative of the progress of the event, the indicator being a visual indicator including a predetermined number (i) of discrete light emitting units, each light emitting unit being controllable to emit light in a predetermined number (j) of different intensities, i being a number between 4 and 24, and j being a number between 2 and 5.