Can vaping cause cancer? The evidence suggests it might. The Washington Post e Cigarettes Safety Not Yet Proven CANSA The Cancer Association of South Africa CANSA The Cancer Association of South Africa 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 Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA