I have not actually seen much about COPD that is relevant because they really did not know much about the diseases until the last couple of years. Anything that I have seen was not worth picking up because what they were spouting had already been proven to be wrong.
There are a lot of research papers out and available, and that will give you information on what they are discovering and what they are disproving. Easiest way to find those is to set up a couple of google alerts with the key words you want to track. It will get you a lot of links to go through but it is one way. I do that daily on a range of topics and post here whatever I can find that seems relevant or useful.