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Charlie Sheen is pulling back the curtain on his spiral into addiction at the peak of his career.

Sheen, who is opening up about his life in a memoir and upcoming documentary, explained what led him to a life of hard partying in a new interview.

"There was always that voice of doubt – that it was only a matter of time before it all went away – so to enjoy it as heartily as you can," he told People .

CHARLIE SHEEN ADMITS HE ‘LIT THE FUSE’ THAT BLEW HIS LIFE APART AS TURBULENT PAST RESURFACES

Sheen said that he dabbled in many drugs, including crack, opiates and heroin. The "Two and a Half Men" star admitted it's a miracle that he's alive today – he experienced one overdose in 1998 and another close call, noting he kept

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