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 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 Growing the research evidence on e cigarettes by Research at CRUK Medium A comprehensive review of recent peer reviewed research provides the strongest evidence to date that using electronic cigarettes likely causes both oral and lung cancers in humans. https: modernsciences.org vaping likely causes oral lung cancer april E Cigarette Vapor Linked to Lung Cancer in Mice