There is provided an elongate aerosol generating device (100) having a polygonal transverse cross section. The polygon comprises at least 6sides. The elongate aerosol generating device may comprise a substrate receiving cavity (302) adapted to receive an aerosol forming substrate a heating element (406) adapted to heat an aerosol forming substrate to generate an aerosol and a power supply (506) adapted to provide power to the heating element. In addition there is provided an aerosol generating system comprising an elongate aerosol generating device according to any of the preceding claims and a charging device (600) comprising a cavity (602) having a polygonal transverse cross section corresponding to the polygonal transverse cross section of said aerosol generating device the cavity being adapted to receive the elongate aerosol generating device.
