Scientific review finds e cigarettes likely cause lung and oral cancer Many people believe that vaping is less harmful than smoking, but that's a common misconception. In fact, in addition to nicotine, vapes can contain toxic chemicals that could be linked to cancer, Vaping Is Likely To Cause Cancer, Major New Aussie Study Finds: 'Only A Matter Of Time' Secondhand smoke and secondhand aerosol Strongest evidence yet that vaping likely causes cancer Modern Sciences