How much weed do we smoke in Colorado? According to the Coloradoan, a recent study revealed that Coloradoans use about 2.2 million ounces or 142,000 pounds of pot each year. The study conducted by CSU’s Denver-based Colorado Futures Center says an estimated 642,772 Colorado residents use legal pot. By comparison, Coloradans consume 33 gallons of beer per capita each year.