Marijuana is infamous for its ability to middle thoughts and dull reactions. What is less well known is that it may also blunt the progression of Alzheimer’s disease, which relentlessly robs its sufferers of their memories and personality.

4.5 million Americans have the neurodegenerative disorder, which usually strikes after the age of 60 and is found in nearly half of those older than 85.

Doctors had no means to treat the disease until 1993, when the food and Drug Administration approved the Cholinesterase inhibitor Cognex.

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* Summarized of Scientific American Mind (May 2007) and Newsweek (June 2007)