In this photograph taken on Thursday, November 20, 2014, bud tenders Maxwell Bradford, back left, and Emma Attolini display buds in the shape of Christmas trees that are on sale for the holiday season in a recreational marijuana shop in northwest Denver. The nascent marijuana industry in Colorado is targeting holiday shoppers with special deals much like traditional retailers offer. (Photo by David Zalubowski/AP Photo)

In this photograph taken on Thursday, November 20, 2014, plastic marijuna leaves light a Christmas tree as part of holiday display in a recreational marijuana shop in northwest Denver. (Photo by David Zalubowski/AP Photo)

In this photograph taken on Thursday, November 20, 2014, bud tender Emma Attolini displays marijuana bud in shape of Christmas tree on sale for the holiday season in a recreational marijuana shop in northwest Denver. Colorado's nascent marijuana industry has taken aim at cashing in on holiday shoopers with new products while employing sales techniques followed by traditional retailers. (Photo by David Zalubowski/AP Photo)

In this photograph taken on Thursday, November 20, 2014, bud tender Maxwell Bradford shows off holiday stocking filled with more than $500 of marijuana and accessories for sale for the holiday season in a recreational marijuana shop in northwest Denver. Colorado's nascent marijuana industry is employing techniques created by traditional retailers to entice cannabis users to spend their holiday money at the dispensaries. (Photo by David Zalubowski/AP Photo)

In this photograph taken on Thursday, November 20, 2014, a Christmas tree decorated with lighted marijuana leaves sits in the foreground as bud tenders Maggie Slattery, back left, and John Satterfield check over customer's order in a recreational marijuana shop in northwest Denver. (Photo by David Zalubowski/AP Photo)

In this photograph taken on Thursday, November 20, 2014, bud tenders from left John Satterfield, Maxwell Bradford and Emma Attolini decorate a Christmas tree in holiday display at a recreational marijuana shop in northwest Denver. Colorado's marijuana retailers are taking a page out of the playbook of traditional retialers to market their products to holiday shoppers. (Photo by David Zalubowski/AP Photo)