Substance Abuse: Dependant, Demoralized, Ensnared, Enslaved, Enraged
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Last broadcast today, 02:05 on BBC World Service (see all broadcasts).
Duff McKagan nearly drank himself to death, he was one of the founding members of Guns N' Roses - a band famed as much for its bad behaviour as for its music.
But for Duff McKagan, that stopped when - as he puts it - his pancreas exploded.
So he sobered up and went to university.
Now, alongside his financial column for Playboy, he runs a wealth management firm.
So how does the bad boy of rock become a businessman?
(Image: Duff McKagan. Credit: Getty)