SAN DIEGO–Diagnosed three months ago with terminal lymphoma, David Bradley, 46, has stood as such a stirring example of courage in the face of disease that he is inspiring others in his community to get cancer. "Seeing David and the way he's bravely battled this thing, I couldn't help but follow his lead," said neighbor Timothy Willis, injecting himself with a concentrated dose of the carcinogen trichloroethelene in an effort to contract the disease. "David understands that every day is a precious gift. Pretty soon, I'm going to realize that, too." Said Mandy Pitnick, 14, chain-smoking three unfiltered Camels: "I want to be a symbol of hope just like David."