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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 an almost 30% increase in the risk of developing 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.

From: Small-Cell Lung Cancer WebMD Medical Reference

SOURCES:

American Cancer Society.

American College of Chest Physicians.

University of Pittsburgh Medical Center.

UpToDate.

Reviewed by Laura J. Martin on November 16, 2017

SOURCES:

American Cancer Society.

American College of Chest Physicians.

University of Pittsburgh Medical Center.

UpToDate.

Reviewed by Laura J. Martin on November 16, 2017

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What are symptoms due to local growth of a tumor from small-cell lung cancer?

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