The votes raised new questions about whether the federal government would sue to block laws flouting federal drug law. Colorado Gov. John Hickenlooper famously warned residents not to "break out the Cheetos or Goldfish too quickly," and activists predicated a legal showdown.
That didn't happen. In August, the DOJ said it wouldn't sue so long as the states met an eight-point standard that includes keeping pot out of other states and away from children, criminal cartels and federal property.
Colorado law allows adults 21 and older to buy pot at state-sanctioned pot retail stories, and state regulations forbid businesses from advertising in places where children are likely see their pitches.
Only existing medical dispensaries were allowed to apply for licenses, an effort to prevent another proliferation of pot shops. Only a few dozen shops statewide are expected to be open for recreational sales on New Year's Day.
Legal pot's potential has spawned businesses beyond retail shops. Marijuana-testing companies have popped up, checking regulated weed for potency and screening for harmful molds. Gardening courses charge hundreds to show people how to grow weed at home.
Tourism companies take curious tourists to glass-blowing shops where elaborate smoking pipes are made. One has clients willing to spend up to $10,000 for a week in a luxury ski resort and a private concierge to show them the state's pot industry.
Dixie Elixirs & Edibles, maker of pot-infused foods and drinks, is making new labels for the recreational market and expanding production on everything from crispy rice treats to fruit lozenges.
"The genie is out of the bottle," says company president Tripp Keber. "I think it's going to be an exciting time over the next 24 to 48 months."
It's easy to see why the industry is attracting so many people. A Colorado State University study estimates the state will ring up $606 million in sales next year, and the market will grow from 105,000 medical pot users to 643,000 adult users overnight — and that's not counting tourists.
Toni Fox, owner of 3D Cannabis Center in Denver, anticipates shoppers camping overnight to await her first-day 8 a.m. opening. She's thinking of using airport-security-line-style ropes to corral shoppers, and suspects she's going to run out of pot.
A longtime marijuana legalization advocate, she knows it's a crucial moment for the movement.
"We have to show that this can work," she says. "It has to."
The challenges, activists and regulators say, are daunting in Colorado and Washington.
One of the biggest questions is whether they have built an industry that will not only draw in tens of millions of dollars in revenue but also make a significant dent in the illegal market. Another is whether the regulatory system is up to the task of controlling a drug that's never been regulated.
There are public health and law enforcement concerns, including whether wide availability of a drug with a generations-old stigma of ruining lives will lead to more underage drug use, more cases of driving while high and more crime.
As state officials watch for signs of trouble, they will also have to make sure they don't run afoul of the DOJ's conditions.
To stop the drug from getting smuggled out of state, regulators in both states are using a radio-frequency surveillance system developed to track pot from the greenhouses to the stores and have set low purchasing limits for non-residents.
Officials concede that there's little they can do to prevent marijuana from ending up in suitcases on the next flight out. The sheriff in the Colorado county where Aspen is located has suggested placing an "amnesty box" at the city's small airport to encourage visitors to drop off their extra bud.
To prevent the criminal element from getting a foothold, regulators have enacted residency requirements for business owners, banned out-of-state investment and run background checks on every applicant for a license to sell or grow the plant.
Whether the systems are enough is anyone's guess.
For now, all the focus is on 2014. This being Colorado, there will be more than a few joints lit up on New Year's Eve. Pot fans plan to don 1920s-era attire for a "Prohibition Is Over!" party and take turns using concentrated pot inside the "dab bus."
Williams says he's done everything he can, including hiring seven additional staffers to handle customers. All he has to do is open the doors.
"Are we ready to go? Yes," he says. "What's going to happen? I don't know."
Kristen Wyatt can be reached at http://www.twitter.com/APkristenwyatt .
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