Can marijuana prevent memory decline?

Can smoking marijuana prevent the memory loss associated with normal aging or Alzheimer’s disease? This is a question that I have been investigating for the past ten years. The concept of medical marijuana is not a new one. A Chinese pharmacy book, written about 2737 BCE, was probably the first to mention its use as a medicine for the treatment of gout, rheumatism, malaria, constipation, and (ironically) absent-mindedness.

So what does marijuana do in the brain? It produces some excitatory behavioral changes, including euphoria, but it is not generally regarded as a stimulant. It can also produce some sedative effects but not to the extent of a barbiturate or alcohol. It produces mild analgesic effects (pain relief) as well, but this action is not related pharmacologically to the pain-relieving effects of opiates or aspirin.

Finally, marijuana produces hallucinations at very high doses, but its structure does not resemble LSD or...

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http://blog.oup.com/2015/04/can-marijuana-prevent-memory-decline/