As no combustion products are produced when the device is operated and the vapour is not so dense that the detectors of the fire system are triggered, smoking in enclosed rooms is permitted. It is advisable to bear in mind that the operation of the device produces varying amounts of vapour and not everyone around the device may like it. Although it will not have an unpleasant odour, if you are not alone in the room, it is worth checking with other people about the use of the appliance.