Secondhand smoke is a serious health hazard causing more than 41,000 deaths per year. It can cause or make worse a wide range of damaging health effects in children and adults, including lung cancer, respiratory infections and asthma. There is no risk-free level of exposure to secondhand smoke and even short-term exposure potentially can increase the risk of heart attacks.
(https://www.lung.org/quit-smoking/smoking-facts/health-effects/secondhand-smoke)

You can find more information about the laws protecting the public from exposure to secondhand smoke from The American Lung Association by going to www.lung.org/policy-advocacy/tobacco/smokefree-environments