Study found many U.S. adults suffer from both Most American adults with asthma also have an allergy, according to a new study. Researchers examined data on nearly 2,600 people from the U.S. National Health and Nutrition Examination Survey and found that 75 percent of adults aged 20 to 40 with asthma, and 65 percent of adults 55 and older with the condition, have at least … [Read more...] about Got asthma? Odds are you have an allergy, too