Apparatus arranged to heat smokable material to volatilise at least one component of the smokable material, the apparatus comprising: at least one thin-film heater (200; 300) constructed and arranged to heat smokable material contained in use within the apparatus, the thin-film heater having a plurality of heating regions for heating different portions of smokable material contained in use within the apparatus; and a power supply which is arranged to provide the same voltage to a first heating region (220; 320) and a second heating region (230; 330) of the thin film heater; the apparatus being characterised in that: the first heating region has a different watt density from the second heating region; the first heating region has plural first electrically conductive heating portions (222, 224, 226; 322, 324, 326) which are electrically connected in series; the second heating region has plural second electrically conductive heating portions (232, 234, 236; 332, 334, 336) which are electrically connected in series; the electrical resistance of at least one of the first electrically conductive heating portions is different from the electrical resistance of at least one of the second electrically conductive heating portions; and the electrical resistance of at least one of the first electrically conductive heating portions is different from the electrical resistance of at least one other first electrically conductive heating portion. at least one thin-film heater (200; 300) constructed and arranged to heat smokable material contained in use within the apparatus, the thin-film heater having a plurality of heating regions for heating different portions of smokable material contained in use within the apparatus; and a power supply which is arranged to provide the same voltage to a first heating region (220; 320) and a second heating region (230; 330) of the thin film heater; the apparatus being characterised in that: the first heating region has a different watt density from the second heating region; the first heating region has plural first electrically conductive heating portions (222, 224, 226; 322, 324, 326) which are electrically connected in series; the second heating region has plural second electrically conductive heating portions (232, 234, 236; 332, 334, 336) which are electrically connected in series; the electrical resistance of at least one of the first electrically conductive heating portions is different from the electrical resistance of at least one of the second electrically conductive heating portions; and the electrical resistance of at least one of the first electrically conductive heating portions is different from the electrical resistance of at least one other first electrically conductive heating portion. the first heating region has a different watt density from the second heating region; the first heating region has plural first electrically conductive heating portions (222, 224, 226; 322, 324, 326) which are electrically connected in series; the second heating region has plural second electrically conductive heating portions (232, 234, 236; 332, 334, 336) which are electrically connected in series; the electrical resistance of at least one of the first electrically conductive heating portions is different from the electrical resistance of at least one of the second electrically conductive heating portions; and the electrical resistance of at least one of the first electrically conductive heating portions is different from the electrical resistance of at least one other first electrically conductive heating portion.