Secondhand smoke, or environmental tobacco smoke, is a combination of the smoke in the air from a burning cigarette and the smoke exhaled by a person who is smoking. Secondhand smoke is the number one source of indoor air pollution and contains nearly 5,000 chemical compounds including arsenic, formaldehyde and hydrogen cyanide as well as radioactive elements. Like asbestos, it has been classified as a �Class A� carcinogen by the U.S. Environmental Protection Agency. Only 13 other substances are considered as dangerous to human health.

Each year secondhand smoke claims the lives of 53,000 nonsmokers across the nation, and it is known to cause:

Lung cancer Heart disease Nasal sinus cancer

Respiratory disease Bronchitis Middle ear infections

Asthma Pneumonia