There is provided an aerosol generating device comprising a storage portion (113,501) for storing aerosol forming substrate (115,505). The device comprises: a vaporizer (119,509) for heating the aerosol forming substrate (115,505) a capillary material (117,507) for conveying the liquid aerosol forming substrate (115,505) from the storage portion (113,501) towards the vaporizer (119,509) by capillary action and a porous material (201,301,405,511) between the capillary material (117,507) and the vaporizer (119,509).
