A modern take on the health effects of cannabis use: The future of cannabis research.

Jelinsky A.; Zelikoff J. · Explore (New York, N.Y.) · 2026

**Background & Methods** This is a narrative review article examining the health effects of cannabis use in the context of increased legalization across US states. The review synthesizes recent survey data, laboratory research, and human health studies to assess cannabis-related risks and benefits, with particular focus on young adults aged 18-26. **Key Findings** - Cannabis smoking demonstrates a positive correlation with psychotic episodes and respiratory symptoms including chronic bronchitis; young adults appear particularly vulnerable to cognitive effects, though cessation can improve health outcomes. - Many young adults perceive cannabis as carrying lower health risks compared to alcohol or tobacco; however, laboratory and clinical evidence suggests cannabis smoke has potential for significant harm. - Definitive causal relationships between cannabis smoking and severe health outcomes (cancer, chronic diseases) cannot be established due to insufficient clinical data and methodological limitations in existing studies. - Preliminary evidence suggests potential anti-inflammatory properties of cannabis, though these purported benefits lack adequate clinical and basic research support and remain uncharacterized. **Dosage & Administration** Not reported. The review notes that various methods of cannabis use exist beyond smoking, but does not specify doses or standardized administration protocols. **Safety & Adverse Effects** Established adverse effects include psychotic episodes and respiratory symptoms such as chronic bronchitis. Cognitive effects in young adults represent a significant safety concern. The review emphasizes that dual use with tobacco or other substances complicates risk assessment. The FDA has approved cannabis-derived compounds (CBD) for select medical conditions, but whole cannabis remains unapproved for any medical indication. **Evidence Quality** This review identifies substantial gaps in existing cannabis research. Major limitations include: insufficient quantities of clinical data, flawed study designs, failure to distinguish between smoking methods and non-smoking routes of administration, inadequate accounting for polydrug use, and incomplete understanding of cannabis pharmacology including non-psychoactive compounds. The authors note that causal inference regarding severe health outcomes remains impossible with current evidence. The incomplete characterization of both risks and potential benefits necessitates cautious interpretation. Given these methodological constraints and knowledge gaps, particularly for young adults, the authors recommend cautious counseling regarding cannabis use until more rigorous, comprehensive research clarifies long-term health effects.

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