However, as PB points out, you reap what you sow. While his depression was certainly real, given his money, there were legal and effective alternatives other than illegal drugs. To imbibe them was his choice.
That's it, Oli. They seem to go hand-in-hand when you're that messed up. They're fond of calling it "self-medicating." But I think that's just an excuse to get high. But I don't want to go off the beam here. He seemed like a genuinely good soul and an incredible talent.