Image from the BBC article Recreational Cannabis Use Becomes Legal in California.
With six US states - Colorado, Washington, Oregon, Alaska and Nevada as well as California - having legalised cannabis, one in five Americans can now legally purchase the drug.
Despite this, the federal government still regards marijuana as illegal, classifying it alongside heroin and cocaine as a proscribed substance.
Bloomberg reports Customers Line Up for Broad Legal Pot Sales in California.
In 1996, over the objections of law enforcement, President Clinton's drug czar and three former presidents, California voters approved marijuana for medicinal purposes. Twenty years later, voters approved legal recreational use and gave the state a year to write regulations for a legal market that would open in 2018.
Today, 29 states have adopted medical marijuana laws. In 2012, Colorado and Washington became the first states to legalize recreational marijuana. Since then, five more states have passed recreational marijuana laws, including Massachusetts, where retail sales are scheduled to begin in July.
Even with other states as models, the next year is expected to be a bumpy one in California as more shops open and more stringent regulations take effect on the strains known as Sweet Skunk, Trainwreck and Russian Assassin.
At first, pot shops will be able to sell marijuana harvested without full regulatory controls. But eventually, the state will require extensive testing for potency, pesticides and other contaminants. A program to track all pot from seed to sale will be phased in, along with other protections such as childproof containers.
Jamie Garzot, founder of the 530 Cannabis shop in Northern California's Shasta Lake, said she's concerned that when the current crop dries up, there will be a shortage of marijuana that meets state regulations. Her outlet happens to be close to some of California's most productive marijuana-growing areas, but most of the surrounding counties will not allow cultivation that could supply her.
"Playing in the gray market is not an option," Garzot said. "California produces more cannabis than any state in the nation, but going forward, if it's not from a state-licensed source, I can't put it on my shelf. If I choose to do so, I run the risk of losing my license."
In 2016, the state produced an estimated 13.5 million pounds of pot, and 80 percent was illegally shipped out of state, according to a report prepared for the state by ERA Economics, an environmental and agricultural consulting firm. Of the remaining 20 percent, only a quarter was sold legally for medicinal purposes.
That robust black market is expected to continue to thrive, particularly as taxes and fees raise the cost of retail pot by as much as 70 percent.
The first thing California ought to do is commute the sentences of anyone in prison on drug charges.
Mike "Mish" Shedlock