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, Cancer Risk Prevention Oncology Nursing Society New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking The rise of teen vaping is worrying doctors worldwide. While e cigarettes were once marketed as a safer alternative, research shows they contain nicotine, heavy metals, and cancer causing chemicals that can damage developing Do e cigarettes cause cancer? Vaping Post More cancer patients are vaping UPI.com