Related Experiment Video
Updated: Jul 14, 2026

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
Published on: August 18, 2020
Predictors of cannabis use in men with and without psychosis
Bob Green1, David J Kavanagh, Ross McD Young
1Community Forensic Mental Health Service, 42 Albert St, Brisbane 4000, Australia. bobgreen@health.qld.gov.au
Background:
Factors associated with cannabis use among people with psychosis are not well understood.
Aims:
To examine whether people with psychosis and age-matched controls modified cannabis use in response to recent experiences.
Method:
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.
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