Of course we know films that represent certain drugs. An example would be the movie Blow, made in 2001 starring Johnny Depp. I'm sure most of us have also seen the movie Pineapple Express made only a few years back. I just saw the movie Go, not bad at all. Twisted plot but good although a horrible way to portray the effects of ecstasy.
Know what you are getting yourself into. Here is a little chart that might explain abit.