Is Secondhand Vaping Harmful To Your Health? 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 E Cigs and Second Hand Vaping: Dangers and Protections Juul study shows secondhand vaping emissions are less toxic than cigarette smoke Secondhand Vape Plumes Could Form Lung damaging Radicals