A caregiver picks out a marijuana bud for a patient at a marijuana dispensary in Denver on Tuesday, Sept. 18, 2012. Colorado, Oregon and Washington could become the first to legalize marijuana this fall. All three state are asking voters to decide whether residents can smoke pot. The debate over how much tax money recreational marijuana laws could produce is playing an outsize role in the campaigns for and against legalization, and both sides concede they're not really sure what would happen. (AP Photo/Ed Andrieski)

Associated Press
A caregiver picks out a marijuana bud for a patient at a marijuana dispensary in Denver on Tuesday, Sept. 18, 2012. Colorado, Oregon and Washington could become the first to legalize marijuana this fall. All three state are asking voters to decide whether residents can smoke pot. The debate over how much tax money recreational marijuana laws could produce is playing an outsize role in the campaigns for and against legalization, and both sides concede they're not really sure what would happen. (AP Photo/Ed Andrieski)
A caregiver picks out a marijuana bud for a patient at a marijuana dispensary in Denver on Tuesday, Sept. 18, 2012. Colorado, Oregon and Washington could become the first to legalize marijuana this fall. All three state are asking voters to decide whether residents can smoke pot. The debate over how much tax money recreational marijuana laws could produce is playing an outsize role in the campaigns for and against legalization, and both sides concede they're not really sure what would happen. (AP Photo/Ed Andrieski)
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