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 Can vaping cause cancer? The evidence suggests it might. The Washington Post E cigarettes: 'cancer risk close to zero' Bhekisisa Vaping may increase risk of cancer and heart disease, finds study The Independent The Independent Comparing the cancer potencies of emissions from vapourised nicotine products including e cigarettes with those of tobacco smoke Tobacco Control