On Monday, Colorado become the second state to legalize recreational marijuana use for adults. Washington also voted to legalize pot this November, and 18 states have decriminalized the drug.
Pot smokers formally gained the right to light up in Colorado on Monday as Governor John Hickenlooper signed into effect a controversial ballot measure legalizing marijuana for adult recreational use in what proponents hailed as a "historic day."
Hickenlooper's signature, largely a formality, made Colorado the second U.S. state after Washington to legalize recreational pot use, and put it on a possible collision course with the federal government - which calls marijuana an illegal drug.
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