What chemicals are in a cigarette? What does smoking do to your body? Cancer Research UK Irish Cancer Society position on e cigarettes Irish Cancer 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 Supporting Tobacco Cessation on World Lung Cancer Dayand Beyond American Association for Cancer Research (AACR) Genetic evidence that e cigarettes increase cancer (and other disease) risk among young adults Stanton Glantz blog Health Information Leaflet Service