Is Second Hand Vapor from E Cigarettes Dangerous? [Infographic] The Local Brand How Bad Is Second Hand Vape Smoke Is Second Hand Vape Smoke Dangerous? 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 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