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Briefly, the studies that were extracted represented several types of study design (for example, cohort and casecontrol studies), measured exposure in several different ways and varied in their choice of reference categories (where some compared current smokers with never smokers, whereas others compared current smokers with nonsmokers or former smokers)

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doi:10 } : Cite journal requires |journal= (help) "Seasonality in cigarette sales: patterns and implications for tobacco control"