How Bad Is Second Hand Vape Smoke Is Second Hand Vape Smoke Dangerous? Early research says secondhand smoke from vaping may not be as bad as cigarettes, but it's still not harmless. https: fox59.com news national world does vaping cause secondhand smoke doctors explain the side effects First, Second and Thirdhand Smoke: The Differences and Dangers Tobacco Stops With Me Project Filter Secondhand Vape Informational Poster #2 Idaho Health Tools We protect kids from cigarette smokelet's do the same with vaping. Secondhand vape isn't harmless, here is what parents need to know: https: www.undo.org disease secondhand vape