Exposing adolescent rats to THC disrupted normal maturation of a key set of neurons in a brain area that corresponds to the human prefrontal cortex. The disruptions produced structural differences that resemble patterns which have been observed in people with addiction and schizophrenia.
The spread of marijuana use and the opioid epidemic over the past 10 years have affected middle-aged and older Americans. In addition, prescription opioid and benzodiazepine misuse increased older adults’ risk of suicidal thoughts.
Some teens' marijuana use has been linked to disrupted communication between two key regions in the brain’s reward circuitry at age 20. Disrupted communication between the regions was associated with poorer psychosocial functioning at age 22.