Overview Nicotinic Receptor Levels After Stopping Smoking Status: Completed Trial end date: 2012-12-01 Target enrollment: Participant gender: Summary This positron emission tomography (PET) study examines the effects of 24 hours abstinence from smoking on return to availability of neuronal nicotinic receptors in slow and fast metabolizers of nicotine. Details Lead Sponsor: University of PennsylvaniaCollaborators: National Cancer Institute (NCI)PfizerTreatments: Nicotine