Millions of people are exposed to secondhand smoke every day. People living in multi unit housing are some of the most exposed. The only way to fully protect people from secondhand smoke at 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 Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Tobacco Smoke, Vaping, and Asthma AAFA.org