Abstract: An aerosol generation device includes a power supply module having an power supply; a substrate module having a container for an aerosol substrate; and a heater module configured to detachably engage with the power supply module and having a mouthpiece; a heating element configured to receive power from the power supply and heat the substrate to generate an aerosol; and a receiving means configured to detachably engage with the substrate module and bring the heating element and the substrate together for generating the aerosol. The container of the substrate module is sealed prior to engaging with the heater module. The heater module is configured to break the sealing of the container upon or after engaging with the substrate module. The heater module receiving means is adapted to partly enclose the substrate module when engaged therewith. The power supply module is adapted to partly enclose the heater module when engaged therewith.