There is provided an aerosol generating device for heating an aerosol-forming substrate. The device comprises a storage portion (101) for storing the aerosol-forming substrate and a vaporizer (105； 105') for heating the aerosol-forming substrate to form an aerosol. The storage portion (101) has an outer housing and an internal passageway (103), the storage portion forming a reservoir for the aerosol-forming substrate between the outer housing and the internal passageway, and the vaporizer (105； 105') extends at least partially inside the internal passageway (103) in the storage portion(101). The device further comprises a porous interface (107) at least partially lining the internal passageway (103) for conveying the aerosol-forming substrate from the storage portion (101) towards the vaporizer (105； 105').
