Health A-Z

Secondhand Smoke

Clinical Definition Secondhand smoke is the unintentional inhalation of smoke from a pipe, cigar or cigarette by nonsmokers. Secondhand smoke contains carcinogens and respiratory irritants, which over time can have consequences such as lung cancer and possibly COPD. The two forms of secondhand smoke include mainline smoke and sidestream smoke. Mainstream smoke is smoke exhaled.

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