Throughout Dr. Scott Bentz's career in emergency medicine, marijuana wasn't something he much worried about.

Perhaps a person a month would come in feeling panicky after smoking pot. A sedative and a quiet room usually did the trick.

"It's the easiest emergency medicine case you're going to see," said Bentz, the medical director of emergency services at Presbyterian/St. Luke's Medical Center in Denver.

And then came the day a man arrived in the emergency room so sedated and breathing so slowly after eating a marijuana-infused edible that he was nearly comatose.

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