Cocaine's a helluva drug ... and it will probably cost boxer Tyson Fury his championship belts.
The boxer -- who just pulled out of his Oct. 29th rematch with Wladimir Klitschko -- has tested positive for coke ... multiple sources tell ESPN.
Fury's people had said he pulled out because he was "medically unfit" -- but now we know the boxer had failed a Sept. 22nd urine test.
Fury -- the current WBO, WBA and IBO heavyweight champ -- will likely be stripped of his belts and faces further punishment.
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