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 A analysis of more than 100 studies found the vaping can have long term health consequences. Growing the research evidence on e cigarettes by Research at CRUK Medium Vaping Linked to Early Cancer Signs, New Study Warns Firstpost America YouTube 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,