Secondhand smoke and lung cancer

Secondhand smoke has been classified as a known cause of lung cancer in humans (Group A carcinogen).

Update Date: 11/23/2011

Updated by: David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc., and David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine.

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