The guy on the phone was adamant. He was 50 years old and a new father and he wanted to hang around for a long time. He told Thomas Pearson, a physician at the University of Rochester School of Medicine, that he was in good health and had no symptoms of heart disease. But if a cholesterol-lowering drug could reduce his risk of a heart attack, he would take it. Whatever it costs, I'm willing to pay, he said. "The real question is -- is it worth it?" says Pearson. That's the question as more and more healthy people turn to the medicine cabinet not to treat diseases, but prevent them. The cholest...