e Cigarettes Safety Not Yet Proven CANSA The Cancer Association of South Africa CANSA The Cancer Association of South Africa Australian researchers have issued one of the strongest warnings yet about vaping, saying a major review of evidence suggests e cigarettes are likely to cause lung and oral cancer. The review found signs Switching from smoking to vaping dramatically reduces cancer risk Dr Colin Mendelsohn Vaping, Environmental Toxicants Exposure, and Lung Cancer Risk Lung cancer risks persist with e cigarette use after quitting tobacco smoking