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The number of cigarettes smoked per day (CPD) is a component of commonly used nicotine dependence measures and often used as a smoking cessation treatment outcome. Yet relighting (ie, smoking used cigarette butts) is not usually considered when CPD is assessed, which may underestimate nicotine dependence and result in an inaccurate picture of smoking behaviors. Data from a randomized controlled trial of a smoking cessation intervention were used. Fagerström Test for Cigarette Dependence (FTCD), CPD, and the frequency of smoking (number of