Medical marijuana has been known to help treat chronic pain and nausea but a new study suggests pot also decreases the use of opiates and prescription painkillers If every U.S. state legalized the substance, Americans would save millions of dollars a year through the federal Medicare program Researchers found the total savings come out to $468 million a year a jump from the $165 million saved in 2013 on prescription drugs in Washington D.C. and the 17 states where medical pot is legal
