It was widely speculated that the 47-year-old actor was on a diet of drugs as his behaviour became increasingly bizarre but Sheen has denied that he was taking cocaine at the time of his meltdown on the Late Show with David Letterman
When Letterman asked whether crack cocaine had been a factor in the meltdown, Sheen said, "Here's the confusing part. I wish it was crack cocaine. It wish it was an ocean of vodka, a bathtub full of pills. It was just my brain was kind of separated into itself. I just had to take a stand for what I know was right."
When Letterman pressed the actor again, the actor said that substance had caused him problems in the past.
"Not during the meltdown... During the previous 30 years of my life."
Sheen now stars in the FX series 'Anger Management'. He was infamously dumped from 'Two and a Half Men' in March 2011 after he attacked show's creator Chuck Lorre in media.