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.