Aerosol-generating device, and a capsule for use in an aerosol-generating device

An aerosol-generating system, comprising:

• a capsule comprising:
• a shell comprising a base and at least one side wall extending from the base, the shell containing an aerosol-forming substrate having a solid component and comprising at least one of a nicotine salt matrix and tobacco, and
• a lid sealed on the at least one side wall for forming a sealed capsule,
• wherein the base comprises a recess extending into said shell along a longitudinal axis of the capsule;
• and
• an aerosol-generating device comprising:
• a power supply,
• at least one heater,
• a cavity configured to receive the capsule, and
• a mouthpiece comprising a piercing element configured to pierce the lid of the capsule,
• wherein the at least one heater is configured to be insertable into the recess of the capsule, and
• wherein the mouthpiece comprises at least one air inlet and at least one air outlet, and the piercing element comprises at least one first conduit extending between the at least one air inlet and a distal end of the piercing element, and at least one second conduit extending between the distal end of the piercing element and the at least one air outlet, such that in use, when a user draws on the mouthpiece, air flows along an airflow pathway extending from the at least one air inlet, through the at least one first conduit, through a portion of the capsule, through the at least one second conduit, and exits the at least one outlet.