US Patent 10398175 Inhaling device with user recognition based on inhalation behaviour

A method of controlling operation of an inhaling device is provided, the inhaling device including a gas flow path through which gas can be drawn by the action of a user puff, a gas flow sensor within the gas flow path, and a memory, the method including recording gas flow measurements from the gas flow sensor; comparing the gas flow measurements with the user puff signature stored in the memory to provide a correlation score; and enabling or disabling further operation of the device based on a value of the correlation score. The method allows an inhaling device, such as an electrically operated smoking device or a medical inhaler, to authenticate a user of the device based on a detected puffing behavior.