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Effects of 72-hr abstinence on Questionnaire on Smoking Urges (QSU) factor and Minnesota Nicotine Withdrawal Scale (MNWS) item scores in SS (filled circles) and CS (open circles). Points represent M ± SEM. Significant and trend main effects of time and group are indicated (*p < .05; **p < .01; ***p < .001; ^p < .10).
