@The Kid Lantern so are his powers fine as they are?
I think what KL is saying is that he's overpowered. Scale him down and give him a less diverse pool to pick from. Pick one power that he get's from taking drugs, and only one power. Not different powers from different drugs.
As an aside, I have to agree with Rin. I've known a lot of addicts in my time, and not one has ever been somebody you could describe as heroic. In the end they only ever have one priority, and that's their own self-gratification. I could see High Zone becoming a villain, but never a hero. Or at least he wouldn't be a hero for long, not after the drugs start to take hold. But even as a villain I couldn't see him last long. Superpowers or not, he'd start to become a feeble, gutless, withered sack of skin.
Just make a Caveman, dude.