Millions of people are exposed to secondhand smoke every day. People living in multi unit housing are some of the most exposed. The only way to fully protect people from secondhand smoke at Secondhand Smoke and Electronic Cigarette Aerosol Resources US EPA Complete Guide to Secondhand Vaping Devices Vape Direct Tobacco Smoke, Vaping, and Asthma AAFA.org It's Not Just Cigarettes: Vape Residue Sticks on Surfaces Too Thirdhand Smoke Resource Center Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London