ASPEN, CO – APRIL 18: A woman looks over stem-full of marijuana buds with a special illuminated magnifier at the Cannabis Crown 2010 expo in Aspen, Colorado. Cannabis Crown 2010 is hosting hundreds of marijuana-industry vendors and thousands of marijuana users in two hotels in Aspen, as well as holding a hemp fashion show and a marijuana-quality judging. Colorado, one of 14 states to allow use of medical marijuana, has experienced an explosion in marijuana dispensaries, trade shows and related businesses in the last year as marijuana use becomes more mainstream here. (Photo by Chris Hondros/Getty Images)