Are you a daily smoker? Researchers at CAMH are recruiting men and women who are daily cigarette smokers. This study will evaluate the effects of a hypertension medication on cigarette use and responses to smoking during periods of active smoking and abstinence. This is not a treatment study. We are screening participants with varying levels of interest in quitting smoking. Participation involves taking study medication and completing several visits to CAMH over approximately two months. Participants will be compensated. Participants must be 18-60 years old and meet other eligibility requirements. For more information please email: barlab@camh.net or call 416-535-8501 x 6431 Prazosin Study barlab@camh.net 416-535-8501 x 6431 Prazosin Study barlab@camh.net 416-535-8501 x 6431 Prazosin Study barlab@camh.net 416-535-8501 x 6431 Prazosin Study barlab@camh.net 416-535-8501 x 6431 Prazosin Study barlab@camh.net 416-535-8501 x 6431 Prazosin Study barlab@camh.net 416-535-8501 x 6431 Prazosin Study barlab@camh.net 416-535-8501 x 6431 Prazosin Study barlab@camh.net 416-535-8501 x 6431 Prazosin Study barlab@camh.net 416-535-8501 x 6431 Prazosin Study barlab@camh.net 416-535-8501 x 6431