Participants will begin selegiline (or placebo) once a day during Week 1, and dose will be graduated to full study dosage (10 mg/day) by adding an evening intake (a.m. and p.m. dosing) for Weeks 2-8. Day 15 of the trial represents target quit day and the transdermal nicotine patch (21 mg/24hr) will be applied at this time. Patches will be worn in conjunction with study medication for Weeks 3-8, after which the patch will be removed and study medication tapered throughout Week 9.