DEFENSE: The Jets came in with the stingy defensive reputation under Ryan. The Titans have been putting together their own hardhitting unit under coordinator with help from senior assistant coach . Tennessee hit Smith 11 times, and Ropati Pitoitua, who started his career with the Jets, had two sacks against his former team.The NFL's strategy seemed not unlike that of another powerful industry, the tobacco industry, which had responded to its own existential threat by underwriting questionable science through the creation of its own scientific research council and trying to silence anyone who contradicted it. The evidence the NFL used to claim that concussions were no big deal was, laughingly, that so many players returned to the field soon after sustaining one, as if no athlete ever attempted to play while in lessthanoptimal condition.The actual research, meanwhile, showed debilitating brain damage occurring in the brains of NFL players. When asked how many NFL players have what's