Damon Albarn took heroin "for years" in the recording studio.
The Blur frontman admits he took heroin or a number of years during the band's height of fame, and says it was a five-day-a-week habit.
He told GQ Magazine: "I used to go to work and take heroin in the studio and then stop when I came home. That's why I say it's five days a week and two days off, and that's how I existed for several years."
The singer will release his debut solo record 'Everyday Robots' this month.
He explained: "We probably wouldn't have been able to create a record like that unless (we) were, um, somewhat in our own worlds."
But the star insists his days of taking heroin are over and he prefers to focus simply on his music.
He added: "I still like a night out, but I certainly don't do heroin. I haven't done that for a very long time. Music is a compulsion with me."