# Cannabis Use Positively Associated With Regional Brain Volume > **Author:** Benjamin Caplan, MD (ABFM Board Certified, MA Lic. #240562, NPI: 1962722637) > **Publisher:** CED Clinic (https://cedclinic.com) > **Canonical URL:** https://cedclinic.com/cannabis-use-positively-associated-with-regional-brain-volume/ > **Published:** 2026-07-30T18:23:11-04:00 | **Last Modified / Clinically Audited:** 2026-09-08T20:17:47-04:00 > **Clinical Summary:** Cannabis brain volume studies show association, not causation. Dr. Caplan explains what neuroimaging evidence means for clinical safety and long-term outcomes. --- ✦ New CED Clinical Relevance #67 Notable Clinical Interest Emerging findings or policy developments worth monitoring closely. ResearchNeurology[Mental Health](https://cedclinic.com/cannabis-psychiatric-research-findings-depression-anxiety/)AgingTHCSafetyPolicy Dr. Caplan’s Take “The early signals here are worth watching, but we need to be quite careful about how we interpret cross-sectional brain imaging associations without understanding causality, confounding variables, or what these regional volume differences actually mean clinically. Until we have longitudinal studies and mechanistic clarity, I wouldn’t counsel patients that [cannabis use](https://cedclinic.com/cannabis-cardiovascular-health-insights-2024/) promotes [brain health](https://cedclinic.com/cognitive-flexibility-alcohol-cocaine-misuse-effects/) based on this finding alone.” Clinical Perspective 🧠 While this study reports positive associations between [cannabis use](https://cedclinic.com/cannabis-cardiovascular-health-insights-2024/) and regional brain volume, clinicians should interpret these findings cautiously given the significant methodological complexities inherent in neuroimaging research on [substance use](https://cedclinic.com/stroke-risk-assessment-substance-use/). Cross-sectional designs cannot establish causality, and numerous confounders—including socioeconomic status, comorbid psychiatric conditions, alcohol and other drug use, and genetic predisposition—may explain observed associations or create spurious correlations. The lack of clarity on cannabis potency, frequency, duration, and age of initiation limits the applicability of such findings to individual patients, and neuroimaging changes do not necessarily translate to functional or clinical benefit. Given the established risks of [cannabis use](https://cedclinic.com/cannabis-cardiovascular-health-insights-2024/) in adolescents, pregnant individuals, and those with psychotic disorders, clinicians should maintain a nuanced stance that neither dismisses potential harms nor uncritically accepts preliminary neurobiological associations as evidence of net safety. In [clinical practice](https://cedclinic.com/cannabis-reproductive-health-women-clinical-evidence/), providers should 💬 Join the Conversation Have a question about how this applies to your situation? [Ask Dr. Caplan →](https://benjamincaplan.com/ask-dr-caplan) Want to discuss this topic with other patients and caregivers? 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