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What is secondhand smoke?

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Secondhand smoke is the combination of smoke from a burning cigar or cigarette and smoke exhaled by a smoker.

From: Smoking and Asthma WebMD Medical Reference

SOURCES: American Academy of Allergy, Asthma & Immunology: "No Butts About It: Smoking Makes Asthma Worse." 

American Lung Association: "What Is Lung Cancer?" 

U.S. Environmental Protection Agency: "Indoor Environmental Asthma Triggers - Secondhand Smoke."

Reviewed by Nayana Ambardekar on May 12, 2018

SOURCES: American Academy of Allergy, Asthma & Immunology: "No Butts About It: Smoking Makes Asthma Worse." 

American Lung Association: "What Is Lung Cancer?" 

U.S. Environmental Protection Agency: "Indoor Environmental Asthma Triggers - Secondhand Smoke."

Reviewed by Nayana Ambardekar on May 12, 2018

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How harmful is secondhand smoke if you have asthma?

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