A combination of an inhaler and a refill pack. The inhaler comprises a reservoir for an inhalable composition, a heating element and/or vibrating transducer to selectively volatilise at least some components of the composition and at least one inhaler capacitor arranged to supply electrical power to the heater and/or vibrating transducer when a user inhales from the inhaler. The refill pack comprises a refill reservoir of inhalable composition and a battery coupled to a refill capacitor, and is arranged to engage with the inhaler and to simultaneously refill the reservoir and recharge the inhaler capacitor from the refill capacitor. The invention also extends to the inhaler and refill pack separately and to a method of refilling and recharging the inhaler.