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The effects of continuous nicotine infusion on nicotine self-administration (NSA) were studied in rats as a model of nicotine replacement therapy (NRT) in humans. A NSA model in which rats had 23-h/day access to nicotine was used to approximate nicotine access conditions in cigarette smokers. In order to estimate serum nicotine concentrations associated with NSA, arterial and venous serum nicotine...
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