Patients having access to medical marijuana for a longer duration led to a decrease in prescription opioid reduction, according to a study recently published in The Journal of the American Medical Association (JAMA). (Staten Island Advance photos) STATEN ISLAND, N.Y. – Patients having access to medical marijuana for a longer duration led to a decrease in prescription opioid … [Read more...] about Medical marijuana led to decrease in opioid use for chronic pain patients, study finds