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 Lung Cancer Awareness Month offers chance to think about smoking, cancer risk Article The United States Army Rethinking Vaping Electronic cigarette smoke induces lung adenocarcinoma and bladder urothelial hyperplasia in mice PNAS Evidence update on the cancer risk of vaping e cigarettes: A systematic review