What topics does this cannabis study cover?

This study covers research on: THC, Mental Health.

Where was this research published?

Published in The journal of trauma and acute care surgery on June 5, 2026.

THC Mental Health

THC detection doubles in teen trauma cases after marijuana legalization

A budding problem: Marijuana use in pediatric trauma patients before and after legalization.

The journal of trauma and acute care surgery • June 5, 2026 • Moderately Relevant

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AI Summary

Following Michigan's 2018 legalization of recreational marijuana, researchers found a striking increase in THC detection among adolescent trauma patients at a Level I pediatric trauma center. THC positivity nearly doubled, rising from 19.5% to 34.4% among screened patients, with similar increases observed across all trauma admissions. The study of nearly 2,400 adolescents (ages 12-18) also revealed that violent injury mechanisms increased from 27% to 36% in the postlegalization period, suggesting a potential correlation between increased marijuana use and injury risk in this vulnerable population.

The research identified specific risk factors for THC positivity, including the postlegalization era itself (2.39 times higher odds), violent injury mechanisms, older age, and notably alcohol co-use, which increased odds by over 10-fold. Importantly, while physiologic outcomes like mortality and operative interventions remained unchanged, adolescents testing positive for THC were more likely to be discharged to justice or psychiatric facilities (7% vs. 3.2%), indicating greater psychosocial complications requiring mental health or legal intervention.

These findings raise important public health questions about marijuana legalization's real-world impact on adolescent safety and substance use patterns. The study suggests that legalization may be associated with increased accessibility and use among teens, potentially combining with injury-prone behaviors or co-occurring substance use like alcohol. The authors recommend implementing standardized toxicology screening and early substance abuse counseling in pediatric trauma systems to better identify at-risk youth and intervene before injury occurs.

📄 Original Abstract

Marijuana legalization may influence adolescent substance use patterns and injury mechanisms, but pediatric data remain limited. Michigan's 2018 legalization of recreational marijuana created a natural setting to evaluate these trends. This study examined changes in marijuana detection and associated clinical outcomes among adolescent trauma patients before and after legalization. We conducted a retrospective cohort study of patients aged 12 to 18 years treated at a Level I pediatric trauma center from 2015 to 2024. Demographics, injury characteristics, toxicology results, and outcomes were compared between prelegalization and postlegalization eras. Urine drug screening and blood alcohol concentration results were reviewed. Multivariable logistic regression identified independent predictors of tetrahydrocannabinol (THC) positivity. Among 2,386 adolescents (1,123 prelegalization; 1,263 postlegalization), THC positivity increased from 19.5% to 34.4% among screened patients (p < 0.001) and from 4.6% to 8.7% across all trauma patients (p < 0.001). Violent mechanisms rose from 27.0% to 36.0% (p < 0.001). Independent predictors of THC positivity included postlegalization era [adjusted odds ratio (aOR) 2.39, 95% CI: 1.47-3.91], violent mechanism (aOR: 2.38, 95% CI: 1.45-3.91), older age (aOR: 1.21 per year, p = 0.002), and alcohol co-positivity (aOR: 10.19, 95% CI: 2.70-39.57). THC-positive adolescents were more often discharged to justice or psychiatric facilities (7.0% vs. 3.2%, p = 0.04), while length of stay, operative intervention, and mortality were similar. Following recreational marijuana legalization, THC detection among adolescent trauma patients increased alongside a higher proportion of violent injuries. Physiologic outcomes remained unchanged, but psychosocial sequelae were more common. Implementing standardized toxicology screening and early substance use counseling within pediatric trauma systems may enhance identification and prevention. (J Trauma Acute Care Surg. 2026;00: 00-00. Copyright © 2026 Wolters Kluwer Health, Inc. All rights reserved.). Prognostic/Epidemiologic; Level III. Retrospective cohort study.