Teen Cannabis Use Linked to Slower Cognitive Development

Teenagers who begin using cannabis may experience a deceleration in the development of key cognitive functions, according to recent research. The study found that memory, attention, language, and processing speed—areas that typically improve steadily during adolescence—tended to plateau in users while non‑users continued to show gains.

The findings suggest that the onset of cannabis use does not immediately impair cognition but can alter its trajectory over time. Researchers identified tetrahydrocannabinol (THC) as the most likely contributor, particularly in relation to declines in memory performance. The data indicate that early exposure to THC may interfere with the normal maturation of neural circuits involved in these cognitive domains.

These results underscore the importance of monitoring adolescent cannabis use and its potential long‑term effects on brain development. Further investigation is needed to clarify the mechanisms involved and to guide public health recommendations.