Electronic cigarettes (e cigarettes) are sometimes called e cigs, vapes, vape pens, and electronic nicotine delivery systems (ENDS). E cigarettes come in many shapes and sizes. Most e cigarettes contain nicotine. Get the facts about e cigarettes, E Cigarettes and Breast Cancer: Is Vaping Really Safer? Comparing the cancer potencies of emissions from vapourised nicotine products including e cigarettes with those of tobacco smoke Tobacco Control More cancer causing chemicals found in electronic cigarettes The Verge The Side Effects and Cancer Risk Associated with Vaping Can vaping cause cancer? The evidence suggests it might.