Secondhand Vape Exposure: Effects, Who's at Risk, and More According to a Centers for Disease Control and Prevention (CDC) study, 40% of U.S. adults believe that children's exposure to secondhand aerosol from e cigarettes causes only some or little harm, and 5% 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 Amazon.com: NICOTESTS Nicotine Second Hand Smoke and Vape 10 ng Test (5 Pack) : Health & Household Effects Of Second Hand Vape Smoke Thirdhand Smoke Resource Center