An apparatus for generating aerosol comprises a capillary tube (20) includingat least one bend, fluid inlets (20a, b), regions of reduced wall thickness locatedbetween the fluid inlets and the at least one bend, and an outlet (20c) along theat least one bend. The capillary tube is heated to a temperature sufficient tovolatilize fluid in the capillary tube, such that the volatilized fluid dischargesfrom the outlet to form an aerosol.