The invention discloses an inhaler comprising a reservoir (2) for an inhalable composition and a heating element (6) and/or vibrating transducer to selectively volatilise at least some components of the composition. A power source (8) supplies electrical power to the heater/transducer when the user inhales from the inhaler. The inhaler further comprises at least one airflow path (15) arranged to draw air in through the inhaler as a user inhales from an inhaling end (12), and impinge on a plume of composition downstream of the heater/transducer at the inhaling end to reduce the mean particle size of the plume.