Colorado is smoking pot by the ton, and visitors are, too. That’s the conclusion from Colorado pot regulators who have issued the world’s first market study of legal recreational marijuana. The study released late yesterday afternoon concluded that total market demand for marijuana in Colorado is about 130 metric tons a year. That’s about 121 metric tons for residents and almost 9 metric tons a year for visitors. The state concluded that visitors account for 44 percent of the marijuana retail sales in the Denver area. In the mountains and other vacation spots, visitors to Colorado account for 90 percent of dispensary traffic. Colorado’s Department of Revenue compiled the market study, the first since retail sales began in January.