Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Passive vaping time we see it like secondhand smoke and stand up for the right to clean air E cigarettes used in about 5 percent of U.S. homes with kids UPI.com Is Secondhand Vaping Something to be Concerned About? Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN