Weed. I have had many experiences with the herb, indeed... but I think that I have to agree with you. At a certain age, it's just stupid. Weed is a young person's drug, not a middle-ager's... but what we're seeing these days is a bunch of former hippies that grew up with the stuff and think that they're still young enough to use and be cool... instead they end up just looking like pathetic wannabes.

(this is from my own experience of dealing with my father still smoking from time to time.)