Asthma, as many people know, is one of the most common chronic respiratory diseases in both children and adults around the United States. The condition can develop at any age, currently affects over 25 million people, and costs the U.S...

About 25 million Americans have asthma. While most people are diagnosed before age five, one in 12 is diagnosed as an adult.The peak years for the onset of asthma in adulthood are between 45 and 50, said Richard F. Lockey,...