Mike Tyson says he had smoked marijuana in the hours before his famous 2000 fight against Andrew Golota ... but claims it was the ONLY time he was ever high on weed during a bout.
The boxing legend appeared on "The Dan Patrick Show" to talk about his new pot business when Dan asked him how long he'd been using cannabis.
"All my life basically," Tyson said ... before admitting he got high before the "Showdown in Motown."
Tyson said he had smoked before he got in the locker room and when Patrick asked how it affected him during the fight, Mike had a pretty classic answer .