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A new research paper argues there is no scientific support for raising the minimum legal age (MLA) for marijuana use to 25, concluding that proposals based on the theory of brain rewiring until that age are based on misleading science. The researchers suggest an MLA between 18 and 21 is scientifically sound, noting that key brain maturation milestones are reached by 18-21, and evidence does not show uniquely severe harm from cannabis use between ages 21 and 25 compared to use after 25. Furthermore, studies in jurisdictions that have legalized cannabis, such as Canada and Germany, have shown that legalization has not led to increased youth use; in some cases, youth use has declined.

New Paper Argues Against Raising Cannabis Legal Age to 25

Nov 10, 2025

Source:

Kyle Jaeger

Marijuana Moment

The long-standing myth that your brain isn't ready for cannabis until age 25 is finally being dismantled by actual science. A new study in the American Journal on Drug and Alcohol Abuse reveals that the "brain rewiring" argument used to push for a higher legal age is based on shaky, misleading data. Researchers found that major neurological milestones are reached by age 18 to 21, and there’s no evidence that adults in their early twenties suffer unique harms compared to those over 25. In fact, data from legal markets like Canada and Germany shows that legalization often leads to a decrease in youth consumption, rather than the spike prohibitionists fear.

This is a massive win for the community because it pushes back against "mythology-based" policies that treat young adults like children. For everyday tokers, this research supports a fairer, science-backed approach to access, ensuring that legal age limits are defensible and grounded in reality rather than fear-mongering. Keeping the limit at 21 protects the industry from unnecessary over-regulation while respecting the cognitive maturity of young enthusiasts.

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