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Percentage of ever-smokersa who are former smokers (also known as the quit ratio), adults aged ≥ 18 years, by race—United States, 1978–2013. Source: National Health Interview Surveys, 1978–2013; Centers for Disease Control and Prevention: National Center for Health Statistics and Office on Smoking and Health. aEver-smoked >100 cigarettes. Note: Estimates since 1992 incorporate same-day smoking.
