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Mike Tyson claims he fought while high on drugs and used a fake penis to fool dope testers.

“I was a full-blown cokehead,” says Tyson in his autobiography, ‘The Undisputed Truth’.

Former world heavyweight king Tyson claims he spent a large chunk of his career addicted to cocaine and marijuana.

Tyson, 47, admits taking drugs before his shock loss to Londoner Danny Williams in Louisville in July 2004 in his memoir published yesterday.

He claims he first tried cocaine aged just 11 and wrote: “The history of war is the history of drugs. Every great general and warrior from the beginning of time was high.”

The New Yorker, who retired in 2005, also admits devising a fake penis, or his ‘whizzer’ as he called it, to avoid failing drugs tests.

Tyson says he came up with the idea before his fight against Lou Savarese at Hampden Park in June 2000 and one of his team would bring it to each contest.

He admits he had taken ‘blow’ and ‘pot’ before the bout and filled his ‘whizzer’ with someone else’s urine to dupe the testers.

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That same year, Tyson tested positive for marijuana and was fined $200,000.

He blames that failure on being tested before his whizzer caddy - the member of his entourage who carried the fake todger - could hand it over to him.

Tyson also claims he had taken cocaine before his press conference brawl with Lennox Lewis in New York in January 2002 when he bit the Brit on the leg.

“I lost my mind,” said Tyson. “I looked over at him and wanted to hit the motherf*****”.

When he faced Frank Bruno for the first time in February 1989 in Las Vegas, he claims he was in such bad condition that Bruno “should have kicked my ass”. Tyson won inside five rounds.

The two met again in 1996, when Bruno was world champion, and Tyson - who won in the third round - claims the Englishman "smelled of fear."

Tyson, the youngest boxer ever to win the WBC, WBA and IBF heavyweight titles, has retired from boxing and been through years of rehab.

Recently, he has appeared in hit movie The Hangover and a one-man Broadway show and even sung and danced on stage at the Tony awards (go to 3:10).

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This summer, sporting his infamous face tattoo, he claimed to be close to death because of his alcoholism.

He said: “I’m a bad guy. I did a lot of bad things and I want to be forgiven. I want to change my life. I want to live my life sober.

“I don’t want to die. I’m on the verge of dying because I’m a vicious alcoholic.”