Seattle's first and only recreational marijuana store had to close on Friday after running out of stock in just three days after Washington became the second U.S. state to allow pot sales to adults.

Cannabis City opened on Tuesday with at least 10 pounds (4.5 kilograms) of marijuana for sale. By the close of business Thursday, it was all gone. A message on the store's phone line said it would re-open on July 21.

There were widespread concerns that shortages of pot would afflict retailers after the state issued its first 25 licenses to outlets under a heavily regulated and taxed system that was approved by voters in November 2012.