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. Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Evidence Mounts About the Health Impact of Second Hand Vaping Bisnar Chase Secondhand vape plumes could form lung damaging radicals American Chemical Society