None, all effects on short term memory are temporary. Although, it offers neuroprotection, meaning it protects nerves and brain cells. There is also some evidence that it may facilitate brain cell development. The US DHS confirms the scientific research that marijuana can be used as a neuroprotectant and antioxidant, it hold the patent to these uses patent no. 6630507
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Since a stroke patient has had a problem within the brain I would think that marijuana would be the last thing to help a person who has this problem. Marijuana will effect brain function and the stroke has all ready impaired the brain so using it would wouldn't help but hinder recovery.