Is Second Hand Vape Smoke Bad For You? Learn How to Avoid its Side Effects Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Secondhand smoke and vape can trigger your child's asthma attacks. Smoking and vaping are unhealthy for everyone but especially harmful for people with asthma. Whether at home, in the car, or 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