Shows you how incredibly talented he must have been. Like, no one can become the best in their field AND be drug fucked, not over three decades as you claim. Right? I mean, sure drugs can help for a short period but being at the very top over a long period, nah, nobody does that on drugs.
If he succeeded IN SPITE of being drug addicted/fucked as you claim then he was a monumental talent.
Of course there's another possibility. Perhaps he was highly dedicated most of the time and just dabbled recreationally. That seems to explain how he could be at the top for so long. Mmm, maybe it was more just drug use than abusing the opportunity to use as much drugs as possible. Perhaps he only played around with it a bit but otherwise put in the hard yards because if not, **** me, he must have been good to overcome the obstacle that drug abuse creates.