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Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
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Related Experiment Video

Updated: Jun 21, 2026

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study

Published on: August 18, 2020

[Is cannabis a vulnerability factor in schizophrenic disorders].

¹Service d'addictologie, centre hospitalier Sainte-Anne, Paris cedex 14, France. x.laqueille@ch-sainte-anne.fr

Archives De Pediatrie : Organe Officiel De La Societe Francaise De Pediatrie

|July 31, 2009

Summary

Cannabis use is a significant risk factor for schizophrenia, especially when initiated before age 15. Early cannabis consumption can worsen schizophrenia prognosis and accelerate psychotic episodes.

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Published on: August 1, 2025

Area of Science:

Psychiatry
Neuroscience
Addiction Medicine

Context:

Established links between cannabis and schizophrenia.
Cannabis effects mimic schizophrenia symptoms.
Higher rates of cannabis abuse and dependence in schizophrenic populations.

Purpose:

To investigate the role of cannabis as a risk factor in schizophrenic disorders.
To analyze the impact of cannabis consumption on schizophrenia prognosis.
To explore the dose-dependent effect and age of onset in cannabis-induced schizophrenia.

Summary:

Cannabis consumption is a gravity factor in schizophrenia prognosis, accelerating psychotic decompensations.
Cohort studies confirm cannabis as a risk factor, with dose and early onset (before 15) being critical.
Increased cannabinoid receptor diffusion in schizophrenic brains and their role in pubertal cerebral maturity are observed.

Impact:

Highlights cannabis as a modifiable risk factor for schizophrenia.
Informs clinical practice regarding cannabis use in vulnerable populations.
Suggests potential neurobiological mechanisms linking cannabis to schizophrenia pathophysiology.