Smoking, obesity, and their co-occurrence in the United States: cross sectional analysis.

Objectives To describe the prevalence of obesity, smoking, and both health risk factors together among adults in the United States. Design Cross sectional analysis of a national health interview survey. Setting United States. Participants 29 305 adults (aged 18) in 2002. Main outcome measures Prevalence of adults who are obese (body mass index ≥ 30), who smoke, and who are obese and smoke. Prevalence was stratified by age, sex, ethnic group, education, and income. Results 23.5% of adults were obese, 22.7% smoked, and 4.7% smoked and were obese. Conclusions Although the proportion of adults who smoke and are obese is relatively low, this subgroup is concentrated among lower socioeconomic groups. [ABSTRACT FROM AUTHOR]