An intriguing preliminary report out of a prestigious research institute suggests cannabis may actually protect the brain.

LAFAYETTE (KPIX) — A few times a day, 92-year-old Lucy Hanson takes a little capsule; in it is medical marijuana.

“They call it my happy pill and I call it my happy pill,” Hanson laughs.

It’s hard to believe when you talk to her now but, four years ago, Lucy was confused, falling down and speaking gibberish.

She often lay in bed and would make no eye contact with her family or friends.

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Betty Yu ~ SanFrancisco.CBSlocal.com ~