# Effects of Cannabis Use on Adolescent Brain Development New research suggests cannabis use during adolescence may slow cognitive development. - **Source:** [PsyBlog](https://www.spring.org.uk) - **Published:** 2026-08-24 - **Original article:** - **On Brifing:** https://brifing.si/s/f8515a12-2e7c-4860-89ca-35bac401ab12 ## Adolescent Brain Development Process Adolescence is a critical period for rapid neural connection development in the brain. Executive function areas like the prefrontal cortex mature during this time. Studies show significant structural changes occur between ages 12-25. Substance use like cannabis during this period may impact neural development. ## Cognitive Effects of Cannabis THC, cannabis's active compound, interacts with the endocannabinoid system affecting cognitive functions. Regular use is known to impair memory, attention, and decision-making. These effects may be more pronounced in adolescents as their brains are still developing. ## Research Findings Studies show adolescent cannabis users perform worse on cognitive tests. A 2020 meta-analysis found regular users had 5-6 point lower IQ scores on average. Whether these effects are permanent remains under investigation. ## Impact on Neuroplasticity Neuroplasticity, the brain's ability to reorganize itself, peaks during adolescence. Evidence suggests cannabis may slow this process. Animal studies indicate THC delays synaptic pruning and reduces neuronal connection efficiency. ## Risk Factors Early initiation and frequent use pose greater risks. Those starting regular use before age 15 face double the cognitive impairment risk. Family history, genetic predisposition, and co-occurring disorders may amplify effects. ## Academic Consequences Cognitive impairments may lower academic performance. Research shows adolescent cannabis users achieve lower educational outcomes, particularly in math and language skills. ## Long-term Outcomes Adolescent cannabis use may affect adult mental health. Some studies suggest increased risk for schizophrenia and depression, though causality debates continue. ## Prevention Strategies Increasing awareness about cannabis effects is crucial. School-based education and early intervention can reduce risks. Maintaining open family communication and seeking professional support are key steps. ## Sources covering this story - https://www.spring.org.uk/2026/08/cannabis-teen.php — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._