Now see, I think that's messed up. I'd say the using was the lesser of two evils in this situation. Plenty of people do coke and function normally. Selling shit, though, could potentially get YOU in trouble. If you ever take him to sell drugs, unknowingly or not, you'll be charged for the crime as well. And trust me, if he's selling shit and needs a ride, you're going to be the first person he asks. I hate the mentality people have on drugs in this country. TL;DR: Guy above me has it backwards.