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The research aimed to quantify cannabis use and cannabis use disorder prevalence in early-onset psychosis and examine their correlates and impact.

Cannabis use preceded early‐onset psychosis and was associated with worse outcomes

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The research aimed to quantify cannabis use and cannabis use disorder prevalence in early-onset psychosis and examine their correlates and impact.
Systematic review of six databases evaluating cannabis use and cannabis use disorder in early-onset psychosis.
Identified 40 studies involving 3,473 participants aged approximately 16, with 59% males.
Pooled prevalence for current cannabis use was 32.8%, and for lifetime use, it was 40.2%.
Lifetime cannabis use was linked to 36.6% prevalence of cannabis use disorder.
Current cannabis users experienced longer duration of untreated psychosis and higher hospitalization rates.
Cannabis use was associated with less severe symptoms and a lower rate of schizophrenia diagnosis.

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Systematic review quantifies cannabis use and cannabis use disorder in early-onset psychosis, indicating a need for targeted interventions.

Alison Knopf (2026) studied this question.

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Systematic review quantifies cannabis use and cannabis use disorder in early-onset psychosis, indicating a need for targeted interventions.