Secondhand Smoke

african american woman blowing out cigarette smokeSecondhand smoke, also known as environmental tobacco smoke (ETS), is a
mixture of the smoke given off by the burning end of tobacco products
(sidestream smoke) and the smoke exhaled by smokers (mainstream smoke).

Secondhand smoke contains a complex mixture of more than 4,000 chemicals,
more than 50 of which are known or probable human cancer-causing agents