Predictors of cannabis use in men with and without psychosis.
BACKGROUND
Factors associated with cannabis use among people with psychosis are not well understood.


OBJECTIVE
To examine whether people with psychosis and age-matched controls modified cannabis use in response to recent experiences.


METHODS
This study predicted 4 weeks of cannabis use prospectively, using expectancies derived from recent occasions of use.


RESULTS
People with psychosis used cannabis less frequently than controls, but had more cannabis-related problems. More negative cannabis expectancies resulted in less frequent cannabis use over Follow-up. The psychosis group was more likely to moderate cannabis use after negative effects than controls.


CONCLUSIONS
Results offer optimism about abilities of people with psychosis to moderate cannabis use in the short term.
Green
Bob
B
Community Forensic Mental Health Service, 42 Albert St, Brisbane 4000, Australia. bobgreen@health.qld.gov.au
Kavanagh
David J
DJ
Young
Ross McD
RM
D000328:Adult; D000704:Analysis of Variance; D017831:Diagnosis, Dual (Psychiatry); D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000523:psychology*; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D011605:Psychoses, Substance-Induced / Q000209:etiology*; D011618:Psychotic Disorders / Q000523:psychology*; D012307:Risk Factors