I want to be better, too, and I'm continually working at becoming such. But I'm not convinced that tripping is a guaranteed way to betterness, nor how much better any accidental betterness would really be.
And not all probabilities are equal. I haven't implied there exists something which is a guarantee, I have stated that I don't think taking drugs is a guarantee to becoming better. Being more technical, taking drugs as an action for becoming better is heavily outweighed by other options in my expected utility function, both probabilistically and in amount of utility. (Of course this could change.)