Cannabis and non-psychotic mental disorders

Area of Science:

• Psychiatry
• Public Health
• Epidemiology

Background:

• Non-psychotic mental disorders are prevalent and often co-occur with substance use.
• Concerns exist that cannabis legalization may increase the burden of these disorders.
• Existing literature shows cross-sectional links between cannabis use and non-psychotic disorders.

Purpose of the Study:

• To review the longitudinal evidence on the association between cannabis use and non-psychotic mental disorders.
• To assess the causal relationship between cannabis use and the etiology of non-psychotic mental disorders.
• To highlight implications for clinical practice and health policy.

Main Methods:

• Review of existing longitudinal studies examining cannabis use and non-psychotic mental disorders.
• Analysis of the temporality and confounding factors in reported associations.
• Comparison of subjective motivations for medical cannabis use with empirical efficacy data.

Main Results:

• Longitudinal studies on cannabis use and non-psychotic disorders have yielded heterogeneous results.
• There is insufficient evidence to establish a causal role for cannabis in the development of non-psychotic mental disorders.
• A significant contrast exists between self-reported reasons for medical cannabis use and its documented efficacy.

Conclusions:

• The causal link between cannabis use and non-psychotic mental disorders remains unproven.
• Established cross-sectional associations have significant implications for clinical practice and health policy.
• Further high-quality longitudinal research is required to clarify the relationship.