Dennis Peron, the activist who fired up the movement to legalize medical marijuana in California, died on Saturday in a San Francisco hospital. He was 72.

Also a prominent figure in San Francisco’s gay community, Peron was credited as a pioneer in recognizing the health benefits of pot at the height of the Aids crisis in the 1980s.

“A man that changed the world,” his brother Jeffrey Peron wrote on Facebook. “It is with a heavy heart that I announce the passing of my brother Dennis Peron.”

Peron, a friend of the murdered gay rights activist Harvey Milk, helped push through a San Francisco ordinance that allowed the use of medical marijuana.

That was seen as a precursor to the statewide legalization of medical pot in 1996, with the passage of California Proposition 215, which Peron co-wrote. Today, medical marijuana is legal in most US states and Washington DC.

Peron suffered from lung cancer. He lost his partner, Jonathan West, to Aids in 1990.

Born in New York, he was drafted in the late 1960s to serve in Vietnam, where he first encountered cannabis, according to media reports his brother posted on Facebook.

At the height of the US war on drugs in the early 1990s, Peron founded the San Francisco Cannabis Buyers Club, the nation’s first public marijuana dispensary.

He was arrested several times and was once shot in the leg by a police officer, the San Francisco Chronicle reported.

“Not many people would have had the courage at the time that he took up the mantle,” Terrance Alan, a member of the city’s Cannabis Commission, told the newspaper.