The efforts' supporters say legalization is enriching white people but not brown and black people who have been arrested for cannabis crimes at far greater rates than whites.
Recreational pot is legal in eight states and the nation's capital. California, Maine, Massachusetts and Nevada approved ballot questions in November. They join Colorado, Washington, Oregon, Alaska and the District of Columbia, which acted earlier. Twenty-nine states permit medical marijuana.
Massachusetts' ballot initiative was the first to insert specific language encouraging participation in the industry by those "disproportionately harmed by marijuana prohibition and enforcement." The law does not specify how that would be accomplished.
In Ohio, a 2016 medical pot law included setting aside 15 percent of marijuana-related licenses for minority businesses. In Pennsylvania, applicants for cultivation and dispensing permits must spell out how they will achieve racial equity.
Florida lawmakers agreed last year to reserve one of three future cultivation licenses for a member of the Florida Black Farmers and Agriculturists Association.
There have been setbacks as well. The Maryland General Assembly adjourned last month without acting on a bill to guarantee a place for minority-owned businesses after the Legislative Black Caucus complained that no black-owned companies were awarded any of the state's initial 15 medical marijuana cultivation licenses.
There are no solid data on how many minorities own U.S. cannabis businesses or how many seek a foothold in the industry. But diversity advocates say the industry is overwhelmingly white.
The lack of diversity, they say, can be traced to multiple factors: rules that disqualify people with prior convictions from operating legal cannabis businesses; lack of access to banking services and capital to finance startup costs; and state licensing systems that tend to favor established or politically connected applicants.
"It's a problem that has been recognized but has proven to be relatively intractable," said Sam Kamin, a professor at the University of Denver Sturm College of Law who studies marijuana regulation.
In 2010, blacks constituted 14 percent of the U.S. population but made up more than 36 percent of all arrests for pot possession, according to an American Civil Liberties Union study released in 2013. The report found African-Americans were nearly four times more likely than whites to be arrested for cannabis possession.
That study did not report Latino arrests because the FBI data on which it was based did not track Hispanics. But a 2016 study by the ACLU of California and the Drug Policy Alliance found Latinos were cited at 1.4 times the rate of white people for marijuana infractions in Los Angeles and 1.7 times the rate in Fresno.
The Minority Cannabis Business Association has drafted model legislation for states considering new or revised marijuana laws, including language to expunge pot-related convictions and to encourage racial and gender diversity among cannabis businesses.
"The people who got locked up should not get locked out of this industry," said Tito Jackson, a Boston city councilman and mayoral candidate. He suggests Massachusetts give licensing preference to groups that include at least one person with a marijuana conviction.
The Oakland City Council in April voted to set aside half of medical cannabis licenses for people who have been convicted of a marijuana crime or who lived in one of 21 police districts with disproportionately high marijuana arrests. Candidates must meet income restrictions.
Complicating matters is that marijuana remains illegal under federal law -- a fact seen as unlikely to change under President Trump. That makes most banks reluctant to lend money to startup cannabis businesses, which often must rely instead on personal wealth.
An Oakland-based nonprofit known as The Hood Incubator provides training and mentoring to minority cannabis entrepreneurs.
"Maybe they lack the money to get into the industry or they might have, you know, gotten arrested in the past for oh, what do you know? Selling weed. And now they can't actually get into the legal industry," said Ebele Ifedigbo, one of the group's three co-founders.
Under Oakland's program, applicants who don't qualify for a so-called equity license can still get preference if they "incubate" a minority-owned business with free rent or other help.
Dan Grace, president of Dark Heart Nursery, is nervous about finding a partner but ready to make the program work. Debby Goldsberry, Magnolia Wellness dispensary's executive director, said the industry is primed to change and expand.
"Why? Because there's a prohibition that's been out there targeting people in our communities in Oakland, and it's very unfair," she said.
Oakland hosted a business mixer this month that attracted several hundred people, including retirees who have never smoked a joint and people who served time for marijuana offenses and established cannabis businesses.
That group included Shavers, who hopes his drug-related record helps him get office space and investors to grow his delivery service, The Medical Strain.
"It's a blessing in disguise," he said, "but not the blessing I would recommend."
Janie Har reported from the Bay Area and Bob Salsberg reported from Boston. Associated Press writers Brian Witte in Annapolis, Maryland, and Julie Carr Smyth in Columbus, Ohio, contributed to this report.