"I know some people who have quit because of it," said Walker, a 17-year-old Hoover senior who is an offensive lineman for the Buccaneers. "People have decided. And it's a real deterrent, too--if you're presented with a situation, 'Do you want to smoke?' 'No, man, I've got a drug test and I don't know when it's going to be.' It gives people another way to say no."