Interesting thoughts.
In my opinion, the reason that they think that they are better when stoned, is because they are stoned and not thinking straight.
These centres have enough trouble getting people off smoking tobacco. Can you imagine trying to get people off THC?
I sit on the fence with the whole POT argument. I know people who take it, I have never taken it myself. (Referring to one individual) I have seen that it calms him down, allows him to mallow out and de-stress. Two hours later, after his buzz has worn down, he's panicking again. But I can tell that the drug is still in his system, because he's erratic and clumsy (which he normally isn't).
So he will say that he's better stoned, simply because afterwards he is absolutely useless. However, and I feel this is very important, before he lit up, he was lucid, careful, but stressed. There's no point in him being less stressed if his actions are stressing out everyone else.