In order to begin addressing these important issues, this application proposes to utilize state-of-the-art methodologies derived from the field of pharmacogenetics, molecular biology and clinical trials, to (1) examine short-term and long-term efficacy of standard treatment methods, such as the use of nicotine patches, in this population; (2) identify factors that might predict treatment responses; and, (3) examine the interactions between smoking and the effect of antipsychotics, as well as how such interactions might affect smoking cessation. (4) to examine the predictive value of the stages of change on smoking cessation and reduction outcomes in schizophrenic patients receiving different doses of nicotine replacement therapy (NRT) and bupropion as implemented in a randomized trial.