What tests have the FDA done for Gum or the Patch? Have they checked for any toxic substances?? If nicotine contains cancer causing agents which are in e-cigs, then the same nicotine would have the same cancer causing agents in the Gum and the Patch as well !!! There is no difference in the nicotine which is found in the Patch, Nicotine Gum, Nicotrol Inhaler, of E-cigs!! It all is derived from tobacco!!!