We are not claiming nicotine is not without danger. Keep in mind electronic cigarettes are not intended for those who don’t already smoke traditional cigarettes. That being said, your cigarette already contains nicotine. While nicotine is an addictive substance, it is non-carcinogenic. It does not cause cancer. (Some studies have indicated that nicotine actually has some health benefits, such as potentially reducing the risk of Alzheimer’s and supporting relief of the symptoms from Parkinson’s disease.) It is the many other chemicals in cigarettes that cause cancer. Besides the nicotine, e-liquid contains ingredients that are considered generally safe for human consumption by the FDA. However, if you are sensitive to nicotine, or have conditions that are aggravated by the use of nicotine, for example, strokes, heart attacks, pregnancy, etc., you should not use any nicotine product. You should consult your doctor before using products that contain nicotine. Also, consider a zero nicotine oil.