Shortly after the legalization of adult use marijuana in Colorado in 2014, the Colorado Department of Revenue's Marijuana Enforcement Division (MED) requested an estimate of the market size, in metric tons, for marijuana for medical and adult use consumers. It was also noted that it would be helpful to revisit market size and demand over time as more official market data are collected through the state's inventory tracking system. This market update is the culmination of those efforts. It provides an updated view and assessment of Colorado's regulated marijuana markets through 2017, and it improves upon the original 2014 market study methods.