Tommy Chong Has Prostate Cancer

Tommy Chong attends the "Hoodwinked Too! Hood vs Evil" Premiere on April 16, 2011 in Los Angeles, California. Credit: Jason Merritt/Getty

Tommy Chong has a not-so-funny announcement to make.

The comedian and actor best known as one half of the pot-loving duo Cheech & Chong, has prostate cancer, he told CNN Saturday in an interview about his fight to help legalize marijuana.

Chong, 74, explained that he noticed symptoms about eight years ago, but was only diagnosed "about a month ago."

"I've got prostate cancer, and I'm treating it with hemp oil, with cannabis," Chong revealed. "So [legalizing marijuana] means a lot more to me than just being able to smoke a joint without being arrested."

He assured CNN's Don Lemon that his cancer is a "slow stage one [that I've] had for a long time . . .I know it had nothing to do with cannabis; cannabis is a cure."

The star said he quit smoking pot "for health reasons" about a year ago, but ingests hemp oil at night "so I won't be woozy all day . . . I'm taking it as medicine."

Along with pal Cheech Marin, Chong appeared in several "Cheech and Chong" films in the 1970s and 1980s; the duo continue to tour as a comedy act, with dates scheduled for later this year.