#78 Strong Clinical Relevance
High-quality evidence with meaningful patient or clinical significance.
If your teenager uses cannabis, this large-scale study suggests the psychiatric risks are real and significant, particularly for psychosis and bipolar disorder during a critical window of brain development.
A Kaiser Permanente-led study published in JAMA Health Forum followed over 463,000 adolescents aged 13 to 17 through age 26 and found that past-year cannabis use was associated with a doubled risk of developing psychotic and bipolar disorders. Cannabis use preceded psychiatric diagnoses by an average of 1.7 to 2.3 years, suggesting a temporal relationship between adolescent exposure and later psychiatric illness. The findings are particularly concerning given that THC potency in commercial products now regularly exceeds 20 percent in flower and 80 percent in concentrates.
“When a study this large and this rigorous tells us adolescent cannabis use doubles psychosis risk, the responsible clinical position is to take it seriously and build youth prevention into every legalization framework.”
A major Kaiser Permanente longitudinal study tracking 463,000+ adolescents reveals a concerning association: past-year cannabis use correlates with doubled risk of psychotic and bipolar disorders by adulthood. The clinical implications warrant careful consideration in youth mental health screening and substance use counseling.
Dr Caplan published a full clinical review of the original JAMA Health Forum paper, including discussion of methodology, limitations, confounders, and what the findings actually mean for parents and clinicians: Adolescent Cannabis Use and Psychosis Risk – Study Review
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