Vaping Likely Causes Cancer, Major Study Finds : ScienceAlert Vaping 'likely' to cause lung and oral cancers, 'most definitive determination' to date finds E cigarettes are likely to cause lung cancer and oral cancer E cigarettes found to cause change in mouth bacteria which could lead to gum disease or oral cancer E Cigarettes May Lead to Cancer, New Study Finds Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis