smoking 1 cigarette per day Only Smoke a Day? It Can Still Kill You Occasional & Social Smoking |

Smoker is less clunky than person who smokes, of course, so some stick to it as a kind of shorthand, whether in speech or when writing an academic paper

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How Tobacco Smoke Causes Disease: The Biology and Behavioral Basis for Smoking-Attributable Disease: A Report of the Surgeon General (Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health, 2010)

Pathophysiologic mechanisms