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This week, Colorado lawmakers hope to pass the first comprehensive set of recreational pot regulations in the country. They spell out who can sell it, to whom and where. The rules also include a big new tax, which voters will have to go back to the polls to approve.
And as Colorado Public Radio's Ben Markus reports, that's created a whole new set of concerns.
BEN MARKUS, BYLINE: Most people who smoke marijuana smoke it out of a pipe or a rolled joint. Not Dan Pope. He uses a vaporizer called The Volcano.
DAN POPE: It does kind of resemble a kitchen appliance of sorts.
MARKUS: It's stainless steel with a plastic bag attached to the top. It gently heats the marijuana, and the vapors collect in the bag, which Pope can puff on to relieve the pain from his muscular dystrophy.
POPE: So that you avoid the noxious gases associated with smoke, and it's a much lighter, healthier way to use cannabis. And my doctor actually prefers that I do it that way.
MARKUS: When legalization passed in November, Pope thought that he could drop his medical marijuana license, which costs $35 a year, requires a doctor's visit and his name in a state database. But then he heard that taxes on recreational marijuana could be more than 30 percent.
POPE: You know, if a patient's budget is $100 a month on medical marijuana, that's a 30 to $40 a month increase.
MARKUS: Too much of an increase for his fixed income. No one knows how many of Colorado's 108,000 patients will hold on to their medical license for the cheaper marijuana, and that's made some dispensaries cautious about moving to recreational sales.
Norton Arbelaez is a co-owner of River Rock Wellness in north Denver. Customers browse dozens of jars packed with his bright green marijuana buds. Medical shops like this get first crack at becoming recreational, possibly as soon as January. Arbelaez says they'll cater to both types of buyers, kind of like a chain drug store.
NORTON ARBELAEZ: And so, if anything, if you want to think about a Walgreens where part of the Walgreens is over the counter and part is a controlled substance, that is more or less, conceptually, what it's going to look like.
MARKUS: Sure, many patients will keep their medical license, but Arbelaez also expects big things from the recreational side of the business, which will be open to anyone age 21 and over with a valid ID. Arbelaez is conflicted. He wants a low enough tax rate so that their product can remain cost competitive with the black market but...
ARBELAEZ: The industry wants to pay its fair share. The industry wants to contribute to the coffers of the state of Colorado. We want to pay our own way in terms of regulation.
GINA CARBONE: I think voters just assumed that this money would just be, you know, piped right in, kind of just what the industry told them during the campaign, but obviously, that's not the case.
MARKUS: That's Gina Carbone, a founding member of Smart Colorado, a group that opposes widespread retail pot shops. She says, unfortunately, voters must approve any tax the legislature settles on.
CARBONE: And I don't think that a lot of voters knew that they'd have to go back.
MARKUS: Meaning back to the polls. And it makes her nervous that those taxes could fail at the ballot box in November. She points to a recent audit of the medical marijuana enforcement division that found an agency severely underfunded, raising the question of just how regulated Colorado's current medical marijuana industry really is. State House Representative Dan Pabon says there could be dire consequences if the taxes don't pass, and there isn't the money to beef up enforcement.
STATE REPRESENTATIVE DAN PABON: I fear the federal government would become involved. I fear black market concerns, diversion will happen.
MARKUS: And that, he says, could force the Obama administration to put the brakes on retail pot. For NPR News, I'm Ben Markus in Denver.