Pacquiao was talking about Philippines president Rodrigoi Duterte and his plan to crackdown on drug dealers in his home country ... when he delved into his own history with drugs.
"I tried drugs ... many kinds of drugs, all kinds of drugs," Pacquiao reportedly said during an interview in his senate office in the Philippines.
He noted the drug use occurred "before I became a champion."
President Duterte's crackdown has reportedly led to the deaths of more than 3,000 people -- but Pacquaio says he fully supports it because Duterte was chosen by God to "discipline the people.