A total of 762 patients (schizophrenia N=402, schizoaffective disorder N=274, psychosis NOS N=86) were included in this study. The majority of the subjects were Caucasian (58%) and 61% were smokers. Substance use was found to be prevalent in the sample with 584/762 (77%) having co-morbid lifetime use. Cannabis and alcohol use were the most commonly reported substances with 478/762 (63%) using alcohol and 295/762 (39%) using cannabis. Other substances of abuse along with demographic information are reported in Table 1. There was no significant difference in Global Assessment of Functioning (GAF) score between cannabis users 37.8 (10.4) and non-users 38.1 (11.0) p=0.76 and alcohol users 38.2 (10.5) and non-users (37.6 (11.1) p=0.49. Antipsychotics prescribed at the index visit were similar in users and non-users of cannabis or alcohol (data not shown).
