It's actually Mr. Mackey the school counselor guy not Mr. Garrison. Mmmmkay?
Now I haven't done any drugs in years and it was limited when I did, but I'd definitely advocate not doing em.
I just let curiosity get the best of me 5 or 10 times.
The whole thing though is pretty damn overrated, then again so's drinking and so's automatic weapons fire. Seriously.
There's plenty of legal stuff to throw your money away on anyway. Save it for your ride, video games, whatever.