INDIANOLA, Iowa -- Until he tried a marijuana look-alike product called "K2," David Rozga's most dubious decision was getting a Green Bay Packers tattoo on his shoulder.Then the 18-year-old athlete and band standout got high on the fake pot last June and complained to a friend "that he felt like he was in hell," his father said.Though he had never suffered from depression, the teenager went home, found a shotgun and killed himself – one of at least nine U.S.