In Focus:

Heavy marijuana use linked to rare vomiting illness

For 17 years, Chalfonte LeNee Queen suffered periodic episodes of violent retching and abdominal pain that would knock her off her feet for days, sometimes leaving her writhing on the floor in pain.

"I've screamed out for death," said Queen, 48, who lives in San Diego. "I've cried out for my mom who's been dead for 20 years, mentally not realizing she can't come to me."

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