Please use this link to access this publication. Abstract Background Adverse childhood experiences and cannabis use are robustly associated with psychosis risk, with evidence suggesting their co-occurrence may synergistically amplify risk. Objective To synthesize evidence on the co-occurrence between adverse childhood experiences, cannabis use, and psychosis across different populations, examining effects across the psychosis spectrum and providing stage-specific intervention implications. Methods Systematic review of literature (January 2000–January 2024) across PubMed/MEDLINE, PsycINFO, Embase, and Web of Science. Studies were categorized into five groups: general population/community, high-risk, first-episode psychosis, established psychosis, and treatment-seeking clinical samples and intervention studies. Quality was assessed using appropriate tools. Results Sixty-two...