DALLAS - Exposure to cigarette smoke raises the risk among teens of metabolic syndrome, a disorder associated with excess belly fat that increases the chances of heart disease, stroke and diabetes, according to a study. Researchers said it is the first study to establish such a link in teenagers."The bottom line to me is: As we gear up to take on this epidemic of obesity, we cannot abandon protecting our children from secondhand smoke and smoking,” said lead author Dr. Michael Weitzman, executive director of the American Academy of Pediatrics Center for Child Health Research in Rochester, N.Y.