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Arch Intern Med. 2009 Oct 26;169(19):1742-4. doi: 10.1001/archinternmed.2009.315.

Nondaily and social smoking: an increasingly prevalent pattern.

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  • 1Department of Medicine and Cardiovascular Research Institute, Center for Tobacco Control Research and Education, University of California, San Francisco, San Francisco, CA 94143-1390, USA.
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