1. Event History Analysis
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3. Centers for Disease Control and Prevention (CDC)., 2002 . "Number (in millions) of adults 18 years and older who were current, former, or never smokers, overall and by sex, race, Hispanic origin, age, and education, National Health Interview Surveys, selected years-United States, 1965-1995 ,"http://www.cdc.gov/to-bacco/research_data/adults_prev/tab_3.htm.