A cannabinoid inhaler comprising: a housing 1； a reservoir within the housing containing an inhalable composition 8 comprising a cannabinoid or a pharmaceutically acceptable derivative or salt thereof, and an alcohol； a composition flow path from the reservoir to a composition outlet at an inhaling end of the housing； and a non-metered breath-operated outlet valve for controlling the flow of inhalable composition through the composition flow path. Preferably the outlet valve comprises a flexible diaphragm 14, a movable valve element 11, 13 biased (by spring 12) into a position to close the composition flow path, where suction by inhaling at the outlet end 7 causes a pressure differential, lifting the valve element and allowing composition flow. An inhalable composition comprising a cannabinoid, alcohol and glycol and/or glycol ether is also provided, characterised in that the ratio by weight of alcohol to glycol or glycol ether is from 6:1 to 1:1, preferably with a propellant.
