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, The pros and cons of e cigarettes Independent Nurse What Are the Differences Between an E Cigarette and a Vape Kit? New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking Not All E Cigarettes are the Same: What Parents Need to Know Bench Press E Cigarettes Are An Effective Way To Quit Smoking, Finds An Indian Study