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Secondhand Smoke (cont.)

Secondhand Smoke Health Risks

Secondhand smoke contains hundreds of harmful chemicals. About 70 cancer-causing substances have been identified in secondhand smoke, and secondhand smoke has been classified as a "known human carcinogen" by the U.S. Environmental Protection Agency (EPA). A carcinogen is a chemical substance that has been proved to cause cancer.

Besides causing cancers, secondhand smoke carries multiple additional health risks for both adults and children. These risks are outlined in the following sections.

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