The 74-year-old musician experimented heavily with acid and other types of psychedelics during his heyday in the 1960s, kickstarting a lifelong battle with addiction, and the last thing he had to give up was booze.
"I've been sober now for three-and-a-half years," the music icon tells Rolling Stone. "My doctor told me to knock off the alcohol... and I did; I stopped. I feel a lot better, too."
Wilson details his substance abuse battles in his new autobiography, I Am Brian Wilson: A Memoir, and he hopes his tales will highlight the "detrimental and dangerous" affects of drug use for readers, claiming his struggle to stay clean triggered the mental illness that has plagued him for years.
"I want people to realise that drugs can be very detrimental and dangerous," he tells the magazine. "I talk a lot about my bad experiences on drugs in the book for that reason. I've told a lot of people don't take psychedelic drugs. It's mentally dangerous to take. I regret having taken LSD. It's a bad drug."