In all fairness, there is an old argument about drugs and alcohol, that is ignored by both sides, but raises an interesting point:
“Do drugs (and alcohol) make a person weak, or do they use drugs (and alcohol) *because* they are weak?”
Part of the argument supporting the latter is that, while strong people can become addicts, it is far easier for them to quit. Weak people become easily addicted, and very reliant on their drugs, and even if their physical addiction is broken, their psychological addiction is not.
All of us except him hated it. If he was high, I could guide him to his chair at the keypunch machine, and he would become part of it. His fingers a blur, the keypuncher sounding like a machine gun, the stack of punched cards growing.
Never an error. I don't think he even knew he was doing it.
If he wasn't high, he was useless.
I would never let him near aircraft loading equipment when he was high, even though I thought he might do ok.