In this photo taken Tuesday, July 1, 2014, packets of a variety of recreational marijuana named "Space Needle" are shown during packaging operations at Sea of Green Farms in Seattle. The grower, the first business licensed to grow recreational marijuana in Washington state, worked all weekend to have supplies ready for stores that were expected to be granted sale licenses on Monday, July 7, the day before legal recreational pot sales begin on July 8. (AP Photo/Ted S. Warren)
Krystal Klacsan prepares artwork to be hung, Monday, July 7, 2014 behind a case displaying glass bongs at the recreational marijuana store Cannabis City in Seattle. When legal sales begin on Tuesday, July 8, 2014, the store will be the first and only store in Seattle to initially sell recreational marijuana. (AP Photo/Ted S. Warren)
In this July 1, 2014, photo, Bob Leeds, owner of Sea of Green Farms, a recreational pot grower and processor in Seattle, inspects small "clone" plants growing under lights in Seattle. The clones will be grown into full-size plants that produce the sticky "flower" required to make potent recreational marijuana. (AP Photo/Ted S. Warren)
Clerk Havilah Nokes arranges packets of marijuana for sale at Cannabis City on the first day of legal recreational pot sales Tuesday, July 8, 2014, in Seattle. Washington on Tuesday became the second state to allow people to buy marijuana legally in the U.S. without a doctor's note as eager customers who lined up outside stores made their purchases. (AP Photo/Elaine Thompson)
In this Thursday, July 10, 2014, photo, a student examines a sample of the cannabis strain "granddaddy purple" during a cooking class at the New England Grass Roots Institute in Quincy, Mass. The proliferation of marijuana edibles for medical and recreational use is giving rise to a cottage industry of foods, infused olive oils, cookbooks and classes as more states legalize marijuana use. (AP Photo/Michael Dwyer)