Pot smokers have something to celebrate this Valentine’s Day. Sony Pictures has finally put up the red-band (R-rated) trailer of Judd Apatow’s next film, the stoner comedy Pineapple Express, starring Seth Rogen. (You can view it at RidetheExpress.com.) An unfinished version of the trailer was yanked off YouTube last week because of copyright infringement. (An inside source whispered that Apatow had posted the trailer himself. His rep declined to comment.) The more serious worry for Sony, though, was that the studio would be accused of endorsing marijuana use to minors if it didn’t get the trailer taken down. Now, the R-rated trailer is shielded on an “age-gate” site where you have to post your real birthday — checked against public records — to see it. Good news for adult fans of Apatow’s Knocked Up, but a bummer for all those teens who loved Superbad.