The prevalence of U.S. adult smoking declined to 20.8 percent in 2006
In 2006, an estimated 20.8% (45.3 million) of U.S. adults were current cigarette smokers; of these, 80.1% (36.3 million) smoked every day, and 19.9% (9.0 million) smoked some days.
Among current cigarette smokers, an estimated 44.2% (19.9 million) had stopped smoking for more than 1 day during the preceding 12 months because they were trying to quit.
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Source: U.S. Centers for Disease Control and Prevention
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