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 SHARE: If you smoke or vape in your car in the presence of others especially children you're exposing them to harmful secondhand smoke or aerosol. Cracking windows is NOT enough, Does Vaping Cause Second Hand Smoke V2 Cigs UK What is Secondhand Smoke? Allergy & Asthma Network