Do you or your children suffer from allergies? Find out why allergy can make asthma worse. What can you do to prevent sensitivity in the first place or control asthma if it develops. GUEST: David Peden, MD, Associate Professor of Pediatrics, Chief, Division of Allergy, Immunology and Environmental Medicine. Deputry Director of the Center for Environmental Medicine and Lung Biology at the School of Medicine at the University of North Carolina, Chapel Hill.