Partygoers smoke marijuana during a Prohibition-era themed New Year's Eve invite-only party celebrating the start of retail pot sales, at a bar in Denver, in this Dec. 31, 2013, file photo. Colorado is on the brink of becoming the first state with licensed pot clubs. Denver officials are working on regulations to open a one-year pilot of bring-your-own marijuana clubs. (AP Photo/Brennan Linsley, File)
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