A Study To Evaluate The Efficacy And Safety Of Varenicline Compared To Placebo For Smoking Cessation Through Reduction

• Drug: Varenicline Tartrate
  
  Varenicline Tartrate oral tablets 2 (0.5mg) tablets twice a day for 24 weeks (first week titration)
• Drug: Placebo
  
  Matching placebo 2 oral tablets twice a day for 24 weeks (first week titration)

• Active Comparator: Varenicline Tartrate
  
  Intervention: Drug: Varenicline Tartrate
• Placebo Comparator: Placebo
  
  Intervention: Drug: Placebo

Inclusion Criteria:

• Male and female cigarette smokers over the age of 18 years who are not willing/able to quit smoking within the next month but who are willing to attempt to reduce their smoking to work toward a quit attempt within the next 3 months.
• Subjects must have smoked an average of at least 10 cigarettes per day during the past year and during the month prior to the screening visit, with no continuous period of abstinence greater than 3 months in the past year and who have an exhaled carbon monoxide (CO) >10 ppm at screening.
• Subjects with mild to moderate depression or anxiety may be included if their condition is stable.

Exclusion Criteria:

• Subjects with a history of a suicide attempt or any suicidal behavior in the past two years.
• Subjects with severe depression or anxiety.
• Subjects with psychosis, panic disorder, bipolar disorder, post traumatic stress disorder (PTSD), or schizophrenia.
• Subjects with alcohol or substance abuse or dependence (except nicotine) unless in full remission for at least 12 months.