It's going to be pretty hard to keep weed illegal when your grandparents are smoking it to prevent Alzheimer's.

This week scientists found evidence that the psychoactive ingredient in marijuana, tetrahydrocannabinol (THC), may be able to remove the buildup of a toxic protein linked to Alzheimer’s.

It’s good news for the fastest growing group of marijuana users—seniors—and gives those above the age of 50 who haven’t come out of the pot closet a good reason to do so.

The study, published in the June edition of the Aging and Mechanisms of Disease journal, was performed by experts at the Salk Institute.

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Abby Haglage ~ The Daily Beast ~