Liz Kirkaldie's grandson was in the top of his class in high school and a talented jazz bassist when he started smoking pot. The more serious he got about music, the more serious he got about pot.

And the more serious he got about pot, the more he became paranoid, even psychotic. He started hearing voices.

"They were going to kill him and there were people coming to eat his brain. Weird, weird stuff," Kirkaldie says. "I woke up one morning, and no Kory anywhere. Well, it turns out, he'd been running down Villa Lane here totally naked."

Kory came to live with his grandmother for a couple of years in Napa, Calif. She thought maybe she could help. Now, she says that was naïve.

Kory was diagnosed with schizophrenia. Kirkaldie blames the pot.

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