A vaporiser device 10 comprising a device body 20 having a cartridge receptacle 21 at a first end of the device body wherein the cartridge receptacle comprises a notched body that has a notch that exposes a channel air inlet 50 when a cartridge is inserted into the cartridge receptacle, wherein the cartridge 30a comprises a heater, near a first end of a fluid reservoir 32, a mouthpiece 31 that encloses a second end of the reservoir and in fluid communication with the heater, and an air inlet passage located at the first end of the reservoir through which air passes from the channel air inlet to reach the heater when a user draws on the mouthpiece to create suction, wherein the cartridge is insertable in the cartridge receptacle with the first end received in the cartridge receptacle and the mouthpiece remaining exposed outside of the cartridge receptacle, wherein the device body further comprises a puff sensor 27 for detecting a users puffing action, the puff sensor positioned to sense air passing from the channel air inlet into the air inlet passage of the cartridge.
