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Among cigarette smokers, lower levels of consumption, defined as smoking fewer cigarettes per day (CPD) or not smoking daily, are becoming more common. The relationship between cigarette consumption and smoking frequency (daily or nondaily) is not well characterized, and the natural history of light smoking (defined here as smoking ≤10 CPD) is poorly understood.

We assessed changes in CPD and smoking frequency over time among light smokers (≤10 CPD) and very light smokers (≤5 CPD), using a population-based longitudinal survey of 3,083 adult smokers in Massachusetts who were interviewed three times over a 4-year follow-up period (in 2000–2001, 2002–2003, and 2005–2006). We used logistic regression to identify factors associated with light smokers’ progression to heavier smoking or smoking reduction/quitting …