A previously unheard interview with Bob Dylan has revealed that the singer was once addicted to heroin.

"I had a $25 a day habit, and I kicked it," the singer told his friend Robert Shelton, in tapes that have only just come to light.

Shelton's biography, No Direction Home, took 20 years to complete and first came out in 1986.

The tapes were uncovered during research for a revised and updated edition, which has been published to coincide with Dylan's 70th birthday. A film is now in production about the tapes.

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