70 of the 7 Thousand Chemicals in That Smoke Cause Cancer Yeditepe niversitesi Hastanesi e Cigarettes Safety Not Yet Proven CANSA The Cancer Association of South Africa CANSA The Cancer Association of South Africa Flavored e cigarettes may affect the brain differently than non flavored Penn State University Similar DNA changes found in cells of both smokers and e cigarette users UCL News UCL University College London E cigarettes are likely to cause cancer, including in the lungs and mouth, according to a sweeping review of scientific evidence that challenges their positioning as a safer alternative to smoking. There is Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times