<blockquote>Legalization of medical marijuana has been one of the most controversial areas of state policy change over the past twenty years. However, little is known about whether medical marijuana is being used clinically to any significant degree. Using data on all prescriptions filled by Medicare Part D enrollees from 2010 to 2013, we found that the use of prescription drugs for which marijuana could serve as a clinical alternative fell significantly, once a medical marijuana law was implemented.</blockquote>
via <a href="http://content.healthaffairs.org/content/35/7/1230">Medical Marijuana Laws Reduce Prescription Medication Use In Medicare Part D</a>.