E cigarettes may be helping thousands a year to quit smoking, but Stop Smoking Services are still the best option Growing the research evidence on e cigarettes by Research at CRUK Medium 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 Smoke Causes Lung Cancer in Mice NYU Langone News Yorkshire Cancer Research statement on the use of vaping products by children and young people Yorkshire Cancer Research Health Risks of E Cigarettes