I don't consider weed to be any worse than having a beer.
Did you ever see Cheech and Chong's Up in Smoke? That's what happens if you really smoke weed and make a movie. You get two guys and no plot and it's basically like, 'Yeah! Let's drive a van made of weed!' And that's pretty much the movie.
I actually don't smoke weed, but I've played a lot of stoners - especially with Seth Rogen.
