Marijuana plants flourish under the lights at a grow house in Denver, on Thursday, Nov. 8, 2012. Marijuana legalization votes this week in Colorado and Washington state don't just set up an epic state-federal showdown on drug law for residents. The measures also opens the door for marijuana tourism. (AP Photo/Ed Andrieski)

Associated Press
Marijuana plants flourish under the lights at a grow house in Denver, on Thursday, Nov. 8, 2012. Marijuana legalization votes this week in Colorado and Washington state don't just set up an epic state-federal showdown on drug law for residents. The measures also opens the door for marijuana tourism. (AP Photo/Ed Andrieski)
Marijuana plants flourish under the lights at a grow house in Denver, on Thursday, Nov. 8, 2012. Marijuana legalization votes this week in Colorado and Washington state don't just set up an epic state-federal showdown on drug law for residents. The measures also opens the door for marijuana tourism. (AP Photo/Ed Andrieski)
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