age from the numerous types of infections & smoking but I and the Dr's were very pleased with the substancial increase-it took time to increase my level of activity-I now can bike ride 6 miles, walk 6 miles-it seems the only time I now get an asthma attack is from a food reaction and sometimes even a drink (alcohol or even pop)-my inhalers I hardly use-it does get better and your lungs will improv