Learned a lot about COPD from blogs written by people who've been fighting it for years.  One of the first is optimism and refusal to become reclusive or withdrawn or depressed.  Another is making sure vitamin D2 is at high levels.  Hemp Seed Oil is extremely beneficial.   A quantity of NAC has been known for over 40 years to enhance pulmonary function yet few doctors even know of it.  The chemical name is N-acetyl Cysteine.