Colorado has collected $8 million in taxes four months after recreational marijuana shops first opened legally.
The revenue boom from recreation sales means increased scrutiny for the thriving edible pot market—made up of all types of snacks and drinks infused with THC, marijuana's active ingredient. Colorado's governor signed legislation on Wednesday to reduce the potency of edible marijuana products after two recent deaths were possibly linked to pot-infused foods.
The new regulations add to the long list of costs for retail marijuana sellers, said Jamie Lewis, COO of marijuana dispensary and edible pot company Good Chemistry.
The fresh laws prohibit edible pot products from containing more than 10 milligrams of THC per serving, and they require packaging noticeably different from regular foods on such products.
The new rules, however, bring in more business for CannLabs, a company that tests cannabis products in Denver.
CannLabs CEO Genifer Murray told CNBC that revenue has skyrocketed at her testing lab, but that the company still gets rebuffed by waste removal companies and other labs for being involved in the marijuana industry.
"Shame on them," Murray said. "It's going to be a billion-dollar industry."
—Reporting by CNBC's Jane Wells. Written by CNBC's Jeff Morganteen. Reuters contributed to this story.