Lethal Weapon star Danny Glover is fighting in favour of a bill which could see marijuana legalised in California.
The 64-year-old has given his celebrity backing to a campaign to get people to vote to end the prohibition of cannabis and to instead allow officials to control and tax its consumption.
"We're here to do something historic," he explained at a special press conference in Hollywood ahead of upcoming elections.
"Around the issue of social justice, I go to a great number of incarceration houses where I see men and women incarcerated for a small amount of marijuana."
He went on: "Their lives are being changed and impacted, it's been catastrophic".
Danny was joined by Grammy-winning musician Melissa Etheridge who discussed how medical marijuana had relieved some of the side effects of chemo when she had been battling breast cancer.
"It's a way in which we can control, legalise, decriminalise it and get our police doing the work they need to do in creating safe communities," Danny told reporters.
The actor insists he's not worried that speaking out could lose him fans.
"There are a lot of things that people don't agree with me on, maybe it's my stance on the war, many things.
"I remember in the early 70s when I was opposed to the system of apartheid and people didn't agree with me on that, so I don't take a poll and say 'well, who's going to agree with me or not?' I take a poll based on my own convictions, my own research and my own role as a citizen," he said.