New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking E Cigarettes and Vaping OHSU Vaping, Environmental Toxicants Exposure, and Lung Cancer Risk E Cigarettes and Breast Cancer: Is Vaping Really Safer? Exposure to PM2.5 and E cigarette can potentially put you at greater risk of lung cancer . Both exposure to PM2.5 air pollution and e cigarette use are linked to an increased risk of