Nicorette Invisi Extra Strength Patch is an aid to help smokers give up cigarettes. This Nicotine Replacement Therapy (NRT) helps to relieve withdrawal symptoms and cravings associated with stopping in intake of nicotine. The 15mg patch works over a 16-hour period to help smokers of less than 20 cigarettes a day. Nicorette patches release nicotine slowly through the skin. Sometimes the 15mg Patch are used together with either Nicorette 2mg Gum or Nicorette 15mg Inhaler for the treatment of tobacco dependence as part of a stop smoking programme.