text: 21,274 excluded 
  8,273 Previous diagnosis of asthma 
  5,363 Previous diagnosis of COPD 
  190 Age < 18 years 
  1,763 Previous diagnosis of CF, bronchiectasis, pulmonary 
  fibrosis, or lung cancer 
  1,331 History of MI, heart problems, stroke, aortic or cerebral 
  aneurysm, eye surgery, or detached retina in past 3 mos. 
  19 Pregnant, in the third trimester 
  3,715 Under care of respirologist or using an inhaled respiratory 