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 E Cigarette Vapor Linked to Lung Cancer in Mice Research is still evolving, but evidence continues to point to a link between smoking and breast cancer risk. From firsthand and secondhand smoke to vaping and cannabis, here's what scientists knowand what E cigarette vapor linked to cancer in mice National Institutes of Health (NIH) Growing the research evidence on e cigarettes by Research at CRUK Medium New research shows e cigarette use up sharply among younger adults in US during EVALI outbreak and COVID 19 pandemic