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 E cigarettes and cancer: new report faces sharp criticism Vejpkollen.se E cigarettes accelerate lung colonization of breast cancer cells. A. Download Scientific Diagram 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, Growing the research evidence on e cigarettes by Research at CRUK Medium A analysis of more than 100 studies found the vaping can have long term health consequences.