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Jeff Call, owner of the Stonegate pizza-and-rum bar in Tacoma, Wash., walks Saturday, March 2, 2013, down the stairs that lead to the second-floor private club lounge area of the bar that allows the use of marijuana in the form of non-smoke vapor. Call charges patrons a small fee to become a member of the private second-floor club, which prohibits smoking marijuana, but does permit "vaporizing," a method that involves heating the marijuana without burning it. Last fall, Washington and Colorado became the first states to legalize marijuana use for adults over 21. (AP Photo/Ted S. Warren) ( Legalizing Marijuana Bars )

Samantha Anderson, a worker in the upstairs lounge area of Stonegate, a pizza-and-rum bar in Tacoma, Wash., uses a wand to dab potent, hardened marijuana oil on the heated portion of a bong, Saturday, March 2, 2013, to produce marijuana vapor for a customer to inhale. Bar owner Jeff Call charges patrons a small fee to become a member of the private second-floor club, which prohibits smoking marijuana, but does permit "vaporizing," a method that involves heating the marijuana without burning it. Last fall, Washington and Colorado became the first states to legalize marijuana use for adults over 21. (AP Photo/Ted S. Warren) ( Legalizing Marijuana Bars )

"Dab tokens," which are exchanged for doses of marijuana vapor, are shown on the bar, Saturday, March 2, 2013, in the upstairs lounge area of Stonegate, a pizza-and-rum bar in Tacoma, Wash. Owner Jeff Call charges patrons a small fee to become a member of the private second-floor club, which prohibits smoking marijuana, but does permit "vaporizing," a method that involves heating the marijuana without burning it. Last fall, Washington and Colorado became the first states to legalize marijuana use for adults over 21. (AP Photo/Ted S. Warren) ( Legalizing Marijuana Bars )

John Connelly, left, exhales after inhaling marijuana vapor just after midnight Saturday, March 2, 2013, with the help of bar worker Jenae DeCampo, right, in the upstairs lounge area of Stonegate, a pizza-and-rum bar in Tacoma, Wash. Owner Jeff Call charges patrons a small fee to become a member of the private second-floor club, which prohibits smoking marijuana, but does permit "vaporizing," a method that involves heating the marijuana without burning it. Last fall, Washington and Colorado became the first states to legalize marijuana use for adults over 21. (AP Photo/Ted S. Warren) ( Legalizing Marijuana Bars )

Jenae DeCampo, a worker in the upstairs lounge area of Stonegate, a pizza-and-rum bar in Tacoma, Wash., uses a blowtorch Saturday, March 2, 2013, to heat the metal part of a bong used to produce marijuana vapor. Bar owner Jeff Call charges patrons a small fee to become a member of the private second-floor club, which prohibits smoking marijuana, but does permit "vaporizing," a method that involves heating the marijuana without burning it. Last fall, Washington and Colorado became the first states to legalize marijuana use for adults over 21. (AP Photo/Ted S. Warren) ( Legalizing Marijuana Bars )

Pieces potent, hardened marijuana oil known as "shatter," are shown on the bar, Saturday, March 2, 2013, in the upstairs lounge area of Stonegate, a pizza-and-rum bar in Tacoma, Wash. Owner Jeff Call charges patrons a small fee to become a member of the private second-floor club, which prohibits smoking marijuana, but does permit "vaporizing," a method that involves heating the marijuana without burning it. Last fall, Washington and Colorado became the first states to legalize marijuana use for adults over 21. (AP Photo/Ted S. Warren) ( Legalizing Marijuana Bars )

Jeff Call, owner of the Stonegate pizza-and-rum bar, poses for a photo in front of his business, Saturday, March 2, 2013, in Tacoma, Wash. Call charges patrons a small fee to become a member of the private second-floor club in the lounge area upstairs, which allows "vaporizing," marijuana, a method that involves heating the marijuana without burning it. Last fall, Washington and Colorado became the first states to legalize marijuana use for adults over 21. (AP Photo/Ted S. Warren) ( Legalizing Marijuana Bars )

Rachel Schaefer of Denver, second from right, and others smoke marijuana on the official opening night of Club 64, a marijuana-specific social club, where a New Year's Eve party was held, in Denver, Monday Dec. 31, 2012. On Election Day, Nov. 6, 2012, a plurality of Coloradans voted in favor of Proposition 64 to legalize recreational marijuana. (AP Photo/Brennan Linsley) ( Colorado Marijuana Clubs )

A joint is passed around on the official opening night of Club 64, a marijuana-specific social club, where a New Year's Eve party was held, in Denver, Monday Dec. 31, 2012. On Election Day, Nov. 6, 2012, a plurality of Coloradans voted in favor of Proposition 64 to legalize recreational marijuana. (AP Photo/Brennan Linsley) ( Colorado Marijuana Clubs )

A tea cup full of marijuana on Wednesday, Jan. 2, at The Hive Co-Op Cannabis Club in Lafayette. Jeremy Papasso/Boulder Daily Camera ( Hive Co-Op Cannabis Club )

Bongo Love, of Lafayette, takes a hit of marijuana from a vaporizer while sitting next to Kyrie Wozab, of Louisville, on Wednesday, Jan. 2, at The Hive Co-Op Cannabis Club in Lafayette. Jeremy Papasso/Boulder Daily Camera ( Hive Co-Op Cannabis Club )

Rudy Capuchio, of Lafayette, center, takes a hit of marijuana from a vaporizer while smoking with Kyrie Wozab, of Louisville, left, and Heidi Perreria, of Lafayette, right, on Wednesday, Jan. 2, at The Hive Co-Op Cannabis Club in Lafayette. Jeremy Papasso/Boulder Daily Camera ( Hive Co-Op Cannabis Club )