an apparatus and method for delivering an aerosol - forming composition and a separate functional composition for generating a functionalized aerosol vapor which emulates the organoleptic characteristics and properties of mainstream smoke experienced by smoking traditional tobacco - based smoking articles . the apparatus comprises an aerosol - forming liquid which is adapted to deliver aerosol - forming liquid to a heating device and a downstream chamber or zone containing an functional composition comprising one or more organoleptic components such as a taste , fragrance and / or nicotine delivery components . the method comprises generating an aerosol from an aerosol forming liquid and functionalizing the aerosol by subjecting the aerosol to a matrix for the purpose of transferring , delivering or imparting one or more organoleptic properties .