nypost.com — JOVIAL actor Seth Rogan found out the hard way that just because it's your premiere, doesn't mean you can do anything you want. Rogan was at the Maxim party for his new flick, "Pineapple Express," on the rooftop of the Solamar Hotel in San Diego where, spies said, he was smoking a funny-smelling hand-rolled cigarette. One onlooker said, "He was to