Every time we bring up points the dopers refuse to argue against them, ergo to win an argument against a doper every time, use facts.
From what I've read of the thread thus far, you came in with metaphorical guns blazing and just insulted first the thread itself, then anyone who replied to your initial insults.
If someone takes maybe an hour of an evening where they happen to have nothing to do, to use a non-addictive drug, usually they'll be completly fine for whatever they must do the next day, therefore drug use won't make responsible people any more useless.