Patients from The Ohio State University Division of Pulmonary and Critical Care Medicine will be sent a letter explaining the registry and asking about their interest in participating in this registry. The registry and all procedures related to their inclusion will be explained, opportunity to ask questions will be given and a consent document signed prior to any registry activity. Information about the registry will be shared with the community by newspaper ads, Internet postings, word of mouth, flyers, and other pulmonologists in central Ohio. Those potential registrants may choose to make an appointment to complete lung function tests at the Asthma Clinical Research Center.