The purpose of this research study is to find out if an investigational drug, GSK598809 can help people who have very recently quit smoking; the investigators want to find out if continuing to take GSK598809 over six weeks can help prevent smokers from relapsing. To relapse means you "fall back" into smoking again after quitting. The investigators also want to find out if GSK598809 is safe to take without causing too many side effects.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
4-week, Continuous Tobacco Abstinence at the End of the 6-week, Double Blind, Treatment Phase
Timeframe: Week 8 of the study