Copd, is chronic bronchitis, and asthma, they all fall under copd. There is no such thing as copd secondary.
I also have it, and have been tested for apnea, my ox levels are very good right now so I dont need the ox anymore, but I am on inhalers and other medications.
I also have restless leg syndrome....Which is basically caused becuase you are not getting the circulation you need to your legs because of the copd.
If you smoke, that will cause the circulation to worsen...I of course still smoke

, I did quit when I first came out of the hospital, and I was doing great, sleeping at night, my legs werent as bad as they usually are, I hadnt felt that good in a long time.
Yes, im trying to quit smoking again...My pulmonary dr has given me several things to help me quit smoking because of the fact that I have copd, and emphysema.
I hope this helps some.