Can Vaping Cause Cancer? Lung, Oral, and Bladder Teens inhale cancer causing chemicals in e cigarettes E Cigarette How E Cigarettes Work, Health Risks & Teen Use Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link Latest Cochrane Review finds high certainty evidence that nicotine e cigarettes are more effective than traditional nicotine replacement therapy (NRT) in helping people quit smoking Cochrane E cigarettes: 'cancer risk close to zero' Bhekisisa