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Early Cannabis Use Linked to Severe Health Risks

10/30/2025

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Summary

Story summary

JAMA Network Open links cannabis use before age 15 to increased mental and physical health issues in young adulthood.
Researchers analyzed healthcare records of 1,591 teens.
Early and frequent use increased mental health care by 51% and physical health issues by 86%.
The study, led by Massimiliano Orri of McGill University, emphasizes delaying cannabis use to reduce risks, including potential disruption of brain development.

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Story summary

JAMA Network Open links cannabis use before age 15 to increased mental and physical health issues in young adulthood.
Researchers analyzed healthcare records of 1,591 teens.
Early and frequent use increased mental health care by 51% and physical health issues by 86%.
The study, led by Massimiliano Orri of McGill University, emphasizes delaying cannabis use to reduce risks, including potential disruption of brain development.