Among nearly 1,000 adolescents, cannabis use was associated with poorer school performance, attendance, and behavior, with stronger effects in teens who also had a chronic illness.
Pediatricians and school health professionals; parents of teens with chronic health conditions.
2.29x higher prevalence of detention associated with adolescent cannabis use
What the researchers found
Cannabis use was associated with lower grades (APR 1.54), school truancy (APR 2.16), truancy from activities (similar magnitude), and detention (APR 2.29) after controlling for alcohol, nicotine, and demographics. Alcohol and nicotine use were not independently associated with these outcomes. The cannabis-education association was significantly stronger in adolescents with chronic illness (p < 0.001).
Why it matters
By controlling for concurrent alcohol and nicotine use, this study isolates cannabis as the substance most strongly linked to academic problems in teens. The amplified effect in chronically ill adolescents highlights a vulnerable population that may use cannabis for symptom management but face disproportionate educational consequences.
The numbers in context
958 adolescents: 30.7% used alcohol, 23.0% cannabis, 13.2% nicotine in past year. 42.5% had at least one educational impact. Cannabis APRs: lower grades 1.54 (1.13-2.11), school truancy 2.16 (1.52-3.07), detention 2.29 (1.33-3.94). Chronic illness interaction p < 0.001. 46.5% received subspecialty care.
How the study worked
Cross-sectional survey of 958 adolescents (mean age 16.0 years, 58.9% female) receiving general or subspecialty medical care, from 2016-2018. Modified Poisson regression models estimated prevalence ratios for educational impacts, controlling for all three substances simultaneously plus sociodemographic factors.
What this study cannot tell us
Cross-sectional data cannot establish that cannabis use caused educational problems. The clinical sample may not represent all adolescents. Self-reported measures could be affected by social desirability bias. "Chronic illness" was defined by subspecialty care rather than specific diagnoses.
How to read the evidence
Moderate: well-controlled analysis in a clinical sample, but cross-sectional design and self-reported measures limit causal inference.
When this study was published
2024 publication using 2016-2018 data.
The bigger picture
Prevention messaging often lumps all adolescent substance use together. These findings suggest cannabis deserves particular attention for its association with school performance, and that school-based prevention efforts might be most impactful when tailored to students managing chronic health conditions.
Questions still open
- Through what mechanisms does cannabis specifically affect school performance beyond what alcohol and nicotine produce? Does reducing cannabis use in chronically ill teens improve their educational outcomes?
Common questions
Why is cannabis linked to school problems but not alcohol or nicotine?
Why are chronically ill teens more vulnerable?
Read the original research
Substance Use and Educational Impacts in Youth With and Without Chronic Illness.
American journal of preventive medicine, 66(2), 279-290
Citation
Weitzman, Elissa R; Minegishi, Machiko; Wisk, Lauren E; Levy, Sharon. (2024). Substance Use and Educational Impacts in Youth With and Without Chronic Illness.. American journal of preventive medicine, 66(2), 279-290. https://doi.org/10.1016/j.amepre.2023.09.029
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