# New UC San Diego Study on Teen Cannabis Use and Cognitive Development > **Author:** Benjamin Caplan, MD (ABFM Board Certified, MA Lic. #240562, NPI: 1962722637) > **Publisher:** CED Clinic (https://cedclinic.com) > **Canonical URL:** https://cedclinic.com/adolescent-cannabis-cognitive-effects-ucsd-study/ > **Published:** 2026-04-21T08:03:40-04:00 | **Last Modified / Clinically Audited:** 2026-09-28T10:16:12-04:00 > **Clinical Summary:** Explore UC San Diego research on adolescent cannabis cognitive effects and the impact of marijuana use on teen brain development and neurodevelopment. --- ✦ New CED Clinical Relevance  #70Notable Clinical Interest  Emerging findings or policy developments worth monitoring closely. ⚒ Cannabis News  |  CED Clinic [Adolescent Health](https://cedclinic.com/adolescent-cannabis-use-sexual-behavior-study/)Neurodevelopment[Cognitive Function](https://cedclinic.com/reverse-cholesterol-transport-function-cannabis-users/)ThcPediatric Cannabis Why This Matters [Adolescent cannabis use](https://cedclinic.com/adolescent-cannabis-use-and-anxiety-research/) during critical neurodevelopmental periods may have lasting cognitive impacts that clinicians need to consider when counseling young patients and families. This adds to growing evidence that timing of cannabis exposure matters significantly for long-term outcomes. Clinical Summary The UC San Diego research appears to demonstrate measurably slower cognitive processing in adolescents who use cannabis compared to non-using peers. Given that [adolescent brain development](https://cedclinic.com/adolescent-cb1-receptor-antagonism-social-behavior/) continues through the mid-twenties, with particularly active remodeling of executive function networks, any substance that affects this process warrants clinical attention. However, without access to the full study methodology and controls for confounding variables, the specific magnitude and reversibility of these effects remain unclear. Dr. Caplan’s Take “I consistently advise families that adolescent [cannabis use](https://cedclinic.com/cannabis-cardiovascular-health-insights-2024/) carries real cognitive risks that we’re still quantifying. The developing brain deserves the same protection we give other organ systems during growth phases.” Clinical Perspective 🧠 Clinicians should incorporate neurodevelopmental risk discussions into adolescent cannabis conversations, emphasizing that cognitive effects may be more pronounced and potentially longer-lasting when use begins before age 18. Parents and teens need concrete information about timing-dependent risks rather than blanket prohibitions. 💬 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? [Join the forum discussion →](https://cedclinic.com/interact/discussion-forums/) Have thoughts on this? Share it: [𝕏 Share on X](https://twitter.com/intent/tweet?text=Just%20read%20this%20on%20CEDclinic.com%3A%20New%20UC%20San%20Diego%20research%20reveals%20that%20teens%20who%20use%20marijuana%20show%20slower%20...%20-...%20%40drcaplan&url=https%3A//www.instagram.com/reel/DXYjjm6gfEU/)[in Share on LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A//www.instagram.com/reel/DXYjjm6gfEU/)[🦥 Share on BlueSky](https://bsky.app/intent/compose?text=Just%20read%20this%3A%20New%20UC%20San%20Diego%20research%20reveals%20that%20teens%20who%20use%20marijuana%20show%20slower%20...%20-...%20--%20via%20%40drcaplan.bsky.social%20https%3A//www.instagram.com/reel/DXYjjm6gfEU/)[📷 Follow on Instagram](https://www.instagram.com/drbenjamincaplan/)[📝 Read more on Substack](https://substack.com/@doctorapproved)[🔔 Subscribe via RSS](https://cedclinic.com/category/cannabis-news/feed/) 📰 Source: [https://www.instagram.com/reel/DXYjjm6gfEU/](https://www.instagram.com/reel/DXYjjm6gfEU/) Table of Contents - [FAQ](#FAQ)[What is the clinical relevance rating for this cannabis research?](#What_is_the_clinical_relevance_rating_for_this_cannabis_research) - [What age group does this cannabis research focus on?](#What_age_group_does_this_cannabis_research_focus_on) - [What aspects of brain function are being studied?](#What_aspects_of_brain_function_are_being_studied) - [What specific cannabis component is being investigated?](#What_specific_cannabis_component_is_being_investigated) - [Why is this research considered noteworthy for clinicians?](#Why_is_this_research_considered_noteworthy_for_clinicians) - [Related](#Related) ## FAQ #### What is the clinical relevance rating for this cannabis research? This study has been assigned CED Clinical Relevance #70, indicating “Notable Clinical Interest.” This rating suggests the findings represent emerging developments or policy changes that warrant close monitoring by healthcare professionals. #### What age group does this cannabis research focus on? This research specifically examines [adolescent health](https://cedclinic.com/adolescent-cannabis-use-sexual-behavior-study/) in relation to [cannabis use](https://cedclinic.com/cannabis-cardiovascular-health-insights-2024/). The study appears to investigate how cannabis affects developing brains during the critical adolescent period. #### What aspects of brain function are being studied? The research focuses on neurodevelopment and [cognitive function](https://cedclinic.com/reverse-cholesterol-transport-function-cannabis-users/) in adolescents. These are key areas of concern given that the adolescent brain is still developing and may be particularly vulnerable to cannabis effects. #### What specific cannabis component is being investigated? The study specifically examines THC (tetrahydrocannabinol), which is the primary psychoactive component in cannabis. THC is of particular interest due to its potential impact on developing neural systems in adolescents. #### Why is this research considered noteworthy for clinicians? This research addresses the intersection of cannabis use and [adolescent brain development](https://cedclinic.com/adolescent-cb1-receptor-antagonism-social-behavior/), which is increasingly relevant as cannabis policies evolve. Understanding THC’s effects on cognitive function and neurodevelopment helps clinicians make informed recommendations about cannabis use in young patients. 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Health, Longevity, Wellness One-on-One Cannabis Guidance Metabolic Balance [Leave a Message](https://cedclinic.com/contact/) [Metabolic Care](https://cedclinic.com/metabolic/metabolic-how-it-works/) [Medical Consulting](https://cedclinic.com/book/) [Cannabis Care](https://cedclinic.com/book/) [https://cedclinic.com/contact/](https://cedclinic.com/contact/) RELATED READING AT CED CLINIC Continue exploring the evidence [Cannabis affects childhood brain development, is 'real risk' for teens, UCSD finds in long-term study](https://cedclinic.com/cannabis-affects-childhood-brain-development-is-real-risk-for-teens-ucsd-finds-in-long-term-study/) This long-term UCSD study highlights the risks cannabis poses to childhood brain development, emphasizing the importance of early intervention. [Read More](https://cedclinic.com/cannabis-affects-childhood-brain-development-is-real-risk-for-teens-ucsd-finds-in-long-term-study/) [UC San Diego study: Marijuana use affects teen brains](https://cedclinic.com/adolescent-brain-development-cannabis-risks-ucsd-study/) Explore detailed findings from UC San Diego on how marijuana use impacts adolescent brain function and development. [Explore Study](https://cedclinic.com/adolescent-brain-development-cannabis-risks-ucsd-study/) [Analysis of data from 11,000 youth shows slower cognitive progress for those who used cannabis](https://cedclinic.com/cannabis-adolescent-cognitive-development-slower-progress/) A large-scale analysis reveals slower cognitive progress in youth cannabis users, underscoring the need for clinical awareness. [Learn More](https://cedclinic.com/cannabis-adolescent-cognitive-development-slower-progress/) ### Related --- ### Verification & Medical Governance - **Lead Clinical Author:** Benjamin Caplan, MD - **Credentials:** Board Certified in Family Medicine (ABFM), Founder & CMO CED Clinic & CED Foundation, Author of *The Doctor-Approved Cannabis Handbook* (Penguin Random House). - **Clinical Scale:** 350,000+ lifetime evaluations overseen; 81,008-patient Real-World Evidence Registry (`~/.ced_rwe_vault.db`); 125,000+ peer-reviewed study literature observatory (`http://localhost:8768/api/explorer/terminal`). - **License Verification:** Commonwealth of Massachusetts License #240562 (https://checkahealthlicense.mass.gov/). - **NPI Registry:** 1962722637 (https://npiregistry.cms.hhs.gov/provider-view/1962722637). - **Ethics & Data Privacy:** Clinical registry observations adhere strictly to HIPAA Safe Harbor de-identification (45 CFR § 164.514(b)) and criteria for secondary research exemption under 45 CFR § 46.104(d)(4).