Data on covariates, including age, income level (lowest quartile, second quartile, third quartile, and highest quartile), body mass index, alcohol consumption and physical activity (does not do exercise, exercises 12 times per week, exercises 34 times per week, exercises 56 times per week, and exercises almost every day), were collected from the first wave in 20022003
Centers for Disease Control and Prevention show that cigarette smoking remains the leading cause of preventable disease, disability and death, with the habit accounting for more than 480,000 deaths, or about one in five deaths, every year
Date created: 2 November 2011
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