It turned out he had celiac disease, meaning he had to get gluten containing foods out of his diet. Gluten is found
in wheat, barley, rye and oats. Within one month, his
asthma was 98% gone - he said he felt he didn't need his inhalers or any other medication anymore. He took his one inhaler at bedtime - just one puff - "just in case".
If you would like to try the diet, you will need the doctor's ok.