28/05/2026
The risk of developing psychosis is more than tripled for those who abuse cannabis, according to results from a new twin study.
The Myth of the 'Harmless' Herb: Cannabis and the Under-25 Brain
The prefrontal cortex—the area of the brain responsible for impulse control, rational thought, and emotional regulation—is not fully developed until roughly age 25. Introducing modifying chemicals into an unfinished neurobiological system can permanently derail development.
The data is clear. A landmark twin study published by the Norwegian Institute of Public Health demonstrated that cannabis abuse increases the risk of developing psychotic symptoms by 350%. Because the study evaluated identical twins, it bypassed genetic and environmental bias, confirming a direct link between cannabis exposure and severe psychiatric vulnerability.
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https://www.sciencedaily.com/releases/2016/11/161108073134.htm
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