E cigarettes are not a healthier alternative to cigarettes. They contain nicotine and many harmful ingredients that can cause cancer and heart disease. Since these products are relatively new, we don't know all Vaping Now Linked to Cancer? A Recent Study Linking Lung Cancer to Mice Suggests A Possibility Occupational Health & Safety A scientific review has raised fresh concerns about the long term cancer risks of vaping, concluding that e cigarettes are probably carcinogenic, while also acknowledging significant gaps in the evidence. The analysis of reviews Does Vaping Cause Lung Cancer?