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People attending an Amendment 64 watch party in a bar hug after a local television station announced the marijuana amendment's passage, in Denver, Colo., Tuesday, Nov. 6, 2012. The amendment would make it legal in Colorado for individuals to possess and for businesses to sell marijuana for recreational use. (AP Photo/Brennan Linsley)

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."