Economists in the state of Washington recently conducted a study State economists in the state of Washington recently conducted a study and found out that the legalization of marijuana in the region could trigger an increase in the tax revenue of the state. They expect the increase to be around $25 million by July 2015 and approximately $200 million halfway through 2017. With the current number of marijuana vendors in operation in Washington, almost $14 million worth of sales were made from ...