# Cannabis affects childhood brain development, is ‘real risk’ for teens, UCSD finds in long-term study > **Author:** Benjamin Caplan, MD (ABFM Board Certified, MA Lic. #240562, NPI: 1962722637) > **Publisher:** CED Clinic (https://cedclinic.com) > **Canonical URL:** https://cedclinic.com/cannabis-affects-childhood-brain-development-is-real-risk-for-teens-ucsd-finds-in-long-term-study/ > **Published:** 2026-05-21T00:07:38-04:00 | **Last Modified / Clinically Audited:** 2026-09-28T10:54:38-04:00 > **Clinical Summary:** UCSD study confirms cannabis adolescent brain development impact on attention and memory. Clinical evidence for counseling teens and parents. --- ✦ New CED Clinical Relevance #73 Notable Clinical Interest Emerging findings or policy developments worth monitoring closely. ResearchNeurologyPediatricsMental HealthSafetyTHCAnxiety Why This Matters Clinicians need this evidence to counsel adolescent patients and parents about cannabis’s documented effects on attention, processing speed, and memory during critical developmental periods when the brain is still maturing. Understanding these neurodevelopmental risks enables healthcare providers to have informed conversations about substance use during routine visits and identify early signs of [cognitive impairment](https://cedclinic.com/acute-effects-partial-cb1-receptor-agonists-cognition/) in young users. This research supports clinical recommendations to discourage or delay [cannabis use](https://cedclinic.com/cannabis-cardiovascular-health-insights-2024/) in pediatric and adolescent populations where the risk-benefit calculus differs substantially from adult use. Clinical Summary A longitudinal study from UC San Diego has identified significant associations between [cannabis use](https://cedclinic.com/cannabis-cardiovascular-health-insights-2024/) during adolescence and impaired neurodevelopment, particularly affecting attention, reaction time, and memory retention. The research underscores that adolescent brains remain in critical developmental stages where cannabis exposure poses a “real risk” distinct from adult use, with potential long-term cognitive consequences that extend into adulthood. These findings have direct implications for clinical practice, as pediatricians and psychiatrists need to counsel adolescent patients and their families about cannabis-related neurodevelopmental risks rather than dismissing teen use as benign. The study contributes to an emerging evidence base suggesting that the developing brain’s vulnerability to cannabinoid effects may warrant more cautious clinical and public health approaches during this sensitive developmental window. Clinicians should integrate these neurodevelopmental findings into substance use screening and counseling for adolescent patients, emphasizing that early [cannabis use](https://cedclinic.com/cannabis-cardiovascular-health-insights-2024/) during critical brain development periods may result in lasting cognitive deficits. Dr. Caplan’s Take “We’ve known theoretically that cannabinoids affect developing brains, but this UCSD data gives us the specificity we need to counsel families honestly: [adolescent cannabis use](https://cedclinic.com/adolescent-cannabis-use-and-anxiety-research/) isn’t a theoretical risk, it’s a documented one that affects executive function in measurable ways, which is why I tell parents and teens alike that the window of brain development—roughly until age 25—is simply not the time to experiment with this drug.” Clinical Perspective While this UCSD study adds to growing evidence that cannabis exposure during critical developmental periods may affect neurocognitive outcomes, clinicians should recognize that establishing causation in observational research requires caution, particularly given the difficulty in isolating cannabis use from other confounding factors such as concurrent substance use, socioeconomic stress, mental health conditions, and genetic predisposition. The mechanisms by which cannabinoids might disrupt adolescent brain development—particularly in regions governing attention, impulse control, and memory—are biologically plausible given what we know about [endocannabinoid system](https://cedclinic.com/endocannabinoid-system-fear-extinction/) maturation, but the magnitude of risk and its persistence into adulthood remain incompletely characterized. When counseling adolescent patients and their families, clinicians can appropriately incorporate findings on cannabis-related developmental risk into substance use conversations, while acknowledging that individual risk varies and that some youth may be more vulnerable than others. This information is most useful 💬 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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