Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis Nicotine isn't the only hazard to be found in e cigarettes Chicago Tribune E Cigarettes, Vapes, and other Electronic Nicotine Delivery Systems (ENDS) FDA E cigarettes are not a healthier alternative to cigarettes. They contain nicotine and many harmful ingredients that can cause cancer and heart disease. Since these products are relatively new, we don't know all FACT: Most e cigarette users also smoke cigarettes, a pattern known as dual use. This means the tobacco industry isn't helping people quit; it's sustaining addiction through another product. While the industry claims