The Environmental Protection Agency and the Surgeon General classify secondhand smoke as a Class A carcinogen (a substance known to cause cancer in humans).

Nonsmokers who are exposed to secondhand smoke in the workplace for eight hours a day inhale the equivalent of smoking six cigarettes.

Workers who are exposed to secondhand smoke are 34 percent more likely to develop lung cancer.

Nonsmokers who work in places that allow smoking miss twice as many days of work due to illness than those who work in smoke-free workplaces.

Only 32 percent of teenagers have a smoke-free workplace, the lowest rate of protection of any group.