This Nicotine Replacement Therapy (NRT) helps to relieve withdrawal symptoms and cravings associated with stopping in intake of nicotine. When you inhale through the device, air is drawn in and nicotine is released and absorbed though the mouth. Sometimes the 15mg inhalers are used together with the Nicorette Invisi 10mg and 15mg Patch for the treatment of tobacco dependence as part of a stop smoking programme.