Description:On Jan. 1, Colorado became the first state in the U.S. to allow the "retail sale" of marijuana to adults 21 and older.
Stores sold more than $5 million worth of pot in the first week alone. In anticipation, the Denver Post even hired a marijuana editor to exclusively cover the now-legal market.
But the American cannabis discussion is a long way from finished. The debate has an extensive history in the country.(2:30)