For a little while in my teenage years, my friends and I smoked marijuana. It was fun. I have some fond memories of us all being silly together. I think those moments of uninhibited frolic deepened our friendships.
But then we all sort of moved away from it. I don't remember any big group decision that we should give up weed. It just sort of petered out, and, before long, we were scarcely using it.
We didn't give it up for the obvious health reasons: that it is addictive in about one in six teenagers; that smoking and driving is a good way to get yourself killed; that young people who smoke go on to suffer IQ loss and perform worse on other cognitive tests.
I think we gave it up, first, because we each had had a few embarrassing incidents. Stoned people do stupid things (that's basically the point). I smoked one day during lunch and then had to give a presentation in English class. I stumbled through it, incapable of putting together simple phrases, feeling like a total loser. It is still one of those embarrassing memories that pop up unbidden at 4 in the morning.
We gave it up, second, I think, because one member of our clique became a full-on stoner. He may have been the smartest of us, but something sad happened to him as he sank deeper into pothead life.
Third, most of us developed higher pleasures. Smoking was fun, for a bit, but it was kind of repetitive. Most of us figured out early on that smoking weed doesn't really make you funnier or more creative (academic studies more or less confirm this).
We graduated to more satisfying pleasures. The deeper sources of happiness usually involve a state of going somewhere, becoming better at something, learning more about something, overcoming difficulty and experiencing a sense of satisfaction and accomplishment.
One close friend devoted himself to track. Others fell deeply in love and got thrills from the enlargements of the heart. A few developed passions for science or literature.