Can Vaping Cause Lung Cancer? Here's What We Know. What harm does second hand fumes from vaping cause to young lungs? Medical experts want to know ABC7 San Francisco Sitting somewhere when a cloud of cotton candy vapor washes over you? If you can smell the sweet scent of a vape, that's not a great sign. Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Electronic Cigarettes American Nonsmokers' Rights Foundation no smoke .org 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