There is some evidence that marijuana can help heal the brain after a concussion or other traumatic injury. A recent study in the journal Cerebral Cortex showed that in mice, marijuana lessened the bruising of the brain and helped with healing mechanisms after a traumatic injury. Harvard professor emeritus of psychiatry and marijuana advocate Lester Grinspoon recently wrote an open letter to NFL Commissioner Roger Goodell, saying the NFL should stop testing players for marijuana, and that the league should start funding research into the plant's ability to protect the brain. "Already, many doctors and researchers believe that marijuana has incredibly powerful neuroprotective properties, an understanding based on both laboratory and clinical data," he writes. Goodell recently said that he'd consider permitting athletes to use marijuana if medical research shows that it's an effective neuroprotective agent.
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