Voters on Tuesday approved Proposition 64, which would make California the most populous state in the nation to legalize the recreational use of marijuana.

The approval of the ballot measure, which led in recent polls, would create the largest market for marijuana products in the U.S. It comes six years after California voters narrowly rejected a similar measure. Activists said passage would be an important moment in a fight for marijuana legalization across the U.S.

“Proposition 64 will allow California to take its rightful place as the center of cannabis innovation, research and development,” said Nate Bradley, executive director of the California Cannabis Industry Assn.

The initiative allows Californians who are 21 and older to possess, transport and buy up to 28.5 grams of marijuana and to use it for recreational purposes. That expands the law that 20 years ago legalized marijuana for medical use in California.

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