New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking Vaping Leads To Lung Disease Cancer Lungs Mascot Holding Ecigarette Or Vape Device Internal Organ Need Medical Help Lungs Disease From Smoking And Vaping Stock Illustration Download Image Now iStock E cigarette smoke caused lung cancer in mice ecancer Lung cancer risks persist with e cigarette use after quitting tobacco smoking E cigarette vapor linked to cancer in mice National Institutes of Health (NIH) Lung cancer risks remain high for smokers who switch to vaping UPI.com