Go see it.
I saw it tonight in a semi-packed theater, which was odd for Easter Sunday, go figure. Anyway, the guy sitting next to my friend had no idea that it was a comedy and told him "shut up, you immature prick, that isn't funny!" when they introduce 'Cance Boy' in the Jenny Jones spoof in the movie's opening. I looked to the guy and said "WHAT THE FUCK?" He and his wife changed aisles not long after I said that...
The movie's really funny and actually has a really good message. It's not so much about 'Big Tobacco' as much as it is people's right to choose and that people should know what's bad for them and more importantly that it's up to parents and teachers to re-enforce what is and isn't safe not pictures or messages on the side of a box...