The Sooner Smokers Quit Smoking the More Their Cancer Risk is Reduced. What About Vaping? Vaping Post Do E Cigarettes Cause Lung Cancer? Dr James Wilson How Switching to E Cigarettes After Smoking Cessation Affects Lung Cancer Risk 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 Evidence update on the cancer risk of vaping e cigarettes: A systematic review