It's not what he did-- IT'S the WAY he did it... Would you want someone like that in your Armed Forces platoon? Shiver me timbers!!! And he will wind up broke: it's much harder keeping a bundle, than making it. I actually feel sorry for him-- for when he goes broke, he hasn't shown so far the necessary intelligence, drive, wherewithall to make money some other way.
If it was some other drug he was doing, he'd actually have a better chance: potheads do pot usually, because they can't handle pressure-- harder drugs may eventually kill you if you don't get a handle on them, but while you're doing them you should have enough drive / confidence to succeed at something, however fleeting that may be.
And who knows, maybe making a lot of money won't matter to him-- he could be content with a simpler lifestyle-- but no way will he wind up one of the leaders of society, business, etc.