There is provided an aerosol generating device comprising: a housing containing or configured to receive an aerosol forming substrate (210) an outlet (220) formed in the housing wherein in use aerosol generated from the aerosol forming substrate is delivered through the outlet wherein the housing comprises a first wall (230) surrounding the outlet and a second wall (235) surrounding the first wall such that an open ended annular recess (240) is defined between the first and second walls the annular recess being suitable for retaining a compliant mouthpiece cover (300) to the housing the compliant mouthpiece cover being readily compressed but resilient. In use the mouthpiece cover is placed into a user s mouth in order to directly inhale an aerosol generated by the aerosol generating device. There is also provided a removable mouthpiece cover for an electrically operated smoking device comprising a compliant readily compressed but resilient tubular portion defining a central bore and a filter portion covering the bore of the filter portion.
