asthma
You can pass the peak flow test that the standard doctor has which is just blow in the tube but for the class 1 they have a machine connected to a computer which is very percise. I passed it all except for the exhale which should I have low level asthma. I haven't used an inhailor for 20 years and thought I had grown out of it. Anyway you can be on an inhailor and get a class 1 as long as you can meet the peak flow test and have not have an attack within 5 years.
I have to take the inhailor for 6 weeks and then go back and do the test which the doc expects will be fine.