Can Vaping Cause Lung Cancer? Here's What We Know. Have you ever breathed in secondhand vapor from a vape? What exactly are you inhaling? It turns out it's a lengthy list of chemicals. FULL STORY Should I Be Concerned About Secondhand Vaping? Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Electronic Cigarettes American Nonsmokers' Rights Foundation no smoke .org Secondhand Smoke and Electronic Cigarette Aerosols US EPA