In this Jan. 1, 2014, file photo, employees Chris Broussard, left, and David Marlow, work behind sales counter inside Medicine Man marijuana retail store, which opened as a legal recreational retail outlet in Denver. Colorado made roughly $2 million in marijuana taxes in January, state revenue officials reported Monday, March 10, 2014, in the world's first accounting of the recreational pot business.

Brennan Linsley / AP

In this Jan. 1, 2014, file photo, employees Chris Broussard, left, and David Marlow, work behind sales counter inside Medicine Man marijuana retail store, which opened as a legal recreational retail outlet in Denver. Colorado made roughly $2 million in marijuana taxes in January, state revenue officials reported Monday, March 10, 2014, in the world's first accounting of the recreational pot business.