 We plan to test the efficacy of SJW for tobacco cessation in a randomized, double-blind, placebo-controlled, three-arm, parallel group, dose-ranging clinical trial. We will obtain preliminary data about the efficacy of two different oral doses of SJW for improving tobacco abstinence rates and decreasing symptoms of nicotine withdrawal. All subjects will receive a behavioral intervention during participation in the study. A total of 120 subjects will be recruited into the study and randomly allocated to one of the three groups groups A, B, and C. Participants in group A will receive SJW 300-mg three times a day for twelve weeks while participants in group B will receive SJW 600-mg three times a day for twelve weeks. Participants in group C will receive a matching placebo for the same duration. 