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What's the main cause of lung cancer?

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The main cause of all lung cancer is tobacco smoking. But small-cell lung cancer is more strongly linked to smoking than non-small cell lung cancer. Even secondhand tobacco smoke is a risk factor for lung cancer. Those living with a smoker have about a 30% increase in the risk of developing non-small cell lung cancer and 60% increase risk for small cell lung cancer compared to people who are not exposed to secondhand smoke. Nonsmokers can get lung cancer, too. Smoking isn't the only cause, but it's the biggest one.

SOURCES:

American Cancer Society.

American College of Chest Physicians.

University of Pittsburgh Medical Center.

UpToDate.

Reviewed by Melinda Ratini on July 28, 2020

SOURCES:

American Cancer Society.

American College of Chest Physicians.

University of Pittsburgh Medical Center.

UpToDate.

Reviewed by Melinda Ratini on July 28, 2020

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