Article Photos: Pot votes in CO, WA raise specter of weed tourism 2/2

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)