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Objective. We sought to understand who constitutes the sizable population of nondaily, or some-day (SD), smokers.

Methods. We analyzed descriptive statistics and regression results using the 1998–1999 Current Population Survey Tobacco Use Supplement to determine the prevalence of SD smokers, their sociodemographic characteristics, and the smoking patterns and histories of groups differentiated by the length and stability of their SD smoking.

Results. SD smokers make up 19.2% of all current smokers. Among SD smokers, 44.6% have smoked less than daily for at least 1 year, no more than 14.4% are just starting to smoke, and the rest are likely in transition. Overall, SD smokers smoked a mean of 102 cigarettes per month (compared to 566.4 for daily smokers), on an average of 14.5 days out of the past 30.

Conclusions. SD smokers make up a substantial segment of the smoking population. They are …