A 24-hour drug bender left country legend Kenny Rogers terrified.

The Gambler singer has opened up about his drug use and abuse in new book Luck or Something Like it: A Memoir, and he reveals he feared one acid trip would never end.

Rogers recalls psychedelic era hitmaker Mickey Newbury introduced him to the heavy narcotic, urging him to try it and explaining, "It's not really acid."

The singer, who recorded Newbury's song Just Dropped In (To See What Condition My Condition Was In) with his band First Edition in the late 1960s, caved in and spent a weird day as the drug made him happy, sad and crazy.

He explains, "The first eight hours were the most incredible eight hours of my life; the second eight hours I wasn't sure about, and the third eight hours scared me to death. I thought I was never gonna get over it."

Rogers quickly turned his back on heavy hallucinogenics but admits he used to enjoy smoking marijuana. He even performed stoned one night.

He tells U.S. newsman and talk show host Anderson Cooper, "I smoked pot one night and I decided to walk onstage... I thought I was great; I was having the time of my life. I came off the stage the guys in the band said, 'What were you talking about when you went off on this thing about the zoo?' I said, 'What! Why would I have done that?'"