Personally - I don't think drug use for any reason is OK, but that's me. In my life using drugs or alcohol usually means covering up something that needs working on. I started using/drinking because I was socially enept and very shy. Drinking allowed me to get around my shyness and interact socially. It didn't make me better at social interactions, it just made it so I didn't care. I didn't solve my issues until I quit and started forcing myself into situations that helped with the shyness. Gaining a greater ability to interact on a social level acceptably ... well let's just say that's still a work in progress. After all, I AM a geek.
That being said it's always the abuse of, not the use of, that causes issues. Over-eating, spending, gambling, drinking, etc.