COPD is not like lung cancer -- in which I mean, a diagnosis of COPD doesn't belie any specific kind of seriousness.
To put this in perspective, consider that everyone, no matter how healthy or non-smoker or active-lifestyled, will develop SOME COPD-like changes in their airways as they age.
This means that COPD can be very very mild, causing almost no symptoms or only periodic symptoms, and can also be so severe it requires extensive lung surgery to take out the diseased bits of lung. As a side note, COPD stands for chronic obstructive pulmonary disease, which includes but is not limited to any of the following or a combination of them ... bronchiectasis, asthma, chronic bronchitis, emphysema...
Like the previous poster said, the subject of most importance is knowing how to take his medicine (his inhalers) PROPERLY. Inhalers' effectiveness varies greatly depending on technique, meaning that if you're using poor technique, you're not getting good delivery of the drug, and you're also not getting the relief you should be getting. He should also know what the drugs do, specifically, and when to take them. Some drugs, for example, make mucus thinner, some open the airways, and some make swelling inside the airways go down.
There's also the possibility he might need oxygen, though if his COPD is mild, this might never happen.
Searches on the internet can bring up lots of info -- some cities have a lung disorder rehab center, a place for people with chronic lung disease to get together and do exercises and things to help improve their lung function and quality of life while under the care of someone who's trained to deal with COPD patients. There's also clubs and support groups he could join, one such club in my area is called the COLD club, stands for chronic obstructive lung disease.
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