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FWIW my asthma was controlled by salbutamol from mid twenties to early fifties - I appear to have grown out of it, which coincides with retirement and reduced exposure to students and an inadequately cleaned workshop environment. Got any new potential triggers in your life recently?
As a separate issue, my GP will only prescribe Ventolin, not generic salbutamol - he claims that although the ingredients and dosage are the same, the particle size is smaller, making it more effective.
Yes, there is a whole range of diseases which can have reduced lung function as a symptom. The most common is COPD, which is an umbrella term covering a variety of causes of reduced lung function. You may get a definitive diagnosis from X-Ray, but you can also have clear X-Rays and still have COPD. On the other hand, if you can significantly restore your peak flow using bronchodilators, you almost certainly have boring old asthma, as COPD is only marginally affected by asthma drugs. As Wikipedia says,
But you can substitute "life" for "COPD" in that sentence :-)