In one study, researchers at the University of Georgia, Athens, used data from Medicare Part D, a government-run prescription drug program for people older than 65. They found prescriptions filled for all opioids decreased by 2.11m daily doses a year when a state legalized medical marijuana, and by 3.7m daily doses a year when marijuana dispensaries opened. In a second study, researchers at the University of Kentucky examined opioid prescription data from Medicaid, a government-run program for the poor and disabled. More than 74 million Americans use Medicaid. State medical marijuana laws were associated with a 5.8% lower rate of opioid prescribing, and states with recreational marijuana laws were associated with a 6.3% lower rate of opioid prescribing.