i smoked weed a few times with my mates; i never really liked it that much. sure, its fun when you're high but after that it just sucks. so you go get high again. unfortunately my friends haven't grown out of the drugs phase, so whenever they go out to get high, i go swimming or something (training for a triathlon :D).
its a money-sucker, thats for sure. apparently, it also has long-term negative side affects. so i'm now against it.
but the golden rule is, don't knock it till you've tried it.