An apparatus is provided to heat smokeable material to volatilise at least one component of the smokeable material, wherein the apparatus comprises at least one solid reactant and, upon use, the at least one solid reactant is contacted by a liquid or gaseous activating reagent to trigger an exothermic chemical reaction which generates heat. A method of heating a smokeable material to volatilise components of the smokeable material for inhalation is also provided, and use of a chemical heat source to volatilise components of the smokeable material for inhalation.
