• The teen brain is still developing (especially the prefrontal cortex, which controls decision-making and impulse control) until about age 25. Marijuana use can interfere with this process. • Regular use is linked to reduced memory, learning, and attention span. • It can lower IQ and academic performance, especially when started young and used heavily. • Increases risk of anxiety, depression, and paranoia. • Can trigger or worsen psychosis or schizophrenia in people with a family history or gen