Preliminary results from a long-awaited study indicate that cannabis appears to be a safe and well-tolerated treatment for patients managing post-traumatic stress disorder (PTSD), although researchers did not find strong signals of effectiveness.

The study, led by Marcel Bonn-Miller of the University of Pennsylvania and Sue Sisley of the Scottsdale Research Institute, was funded by a $2.2 million grant from the Colorado Department of Public Health and Environment (CDPHE) to the Multidisciplinary Association of Psychedelic Studies (MAPS). Researchers fought for seven years to obtain approval to conduct the study, and it took three more years to carry it out.

For years, many military veterans have used medical marijuana to manage the symptoms of PTSD. It has…

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