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A medical marijuana plant is shown at the Northwest Patient Resource Center medical marijuana dispensary, Wednesday, Nov. 7, 2012, in Seattle. After voters weighed in on election day, Colorado and Washington became the first states to allow legal pot for recreational use, but they are likely to face resistance from federal regulations. (AP Photo/Ted S. Warren)

The marijuana debate

Pot smokers formally gained the right to light up in Colorado on Dec. 10 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."