Millions of people across the U.S. can legally buy pot at dispensaries — but scientists aren’t allowed to study it.

Early in Dr. Sue Sisley’s medical career, military veterans with post-traumatic stress disorder told her that smoking marijuana prevented nightmares and helped them sleep.

Sisley, a primary care physician and psychiatrist in Scottsdale, Arizona, who has treated vets for two decades, said she was initially skeptical of her patients’ claims, but their families vouched that pot was helping with their symptoms.

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Tyler Kingkade ~ NBC News ~