What is Secondhand Smoke?

     Second hand smoke is also known as environmental tobacco smoke or passive smoke. Second hand smoke is the combination of smoke emitted from the burning ends of a tobacco product and the smoke exhaled from the lungs of tobacco users.

     It is a mixture of two forms of smoke that come from burning tobacco: sidestream smoke and mainstream smoke. It contains over four thousand substances, more than sixty of which are known or suspected to cause cancer.

    The U.S. Environmental Protection Agency (EPA) has classified second hand smoke as a Group A carcinogen, a substance which is known to cause human cancer.