Hi my name is Norman I've have Copd since 2007 quite smoking 10 years now I was at 57% lungs function I'll cut to the chase . from 1% to 33 % is severe to moderate copd 34% to 68% severe to Moderate. at 70% and up you would not notice copd or lung Desease If you are a smoker quit. The best thing to loosen Phlegm is get a Thumper vibrator get an Acapella and get steam mask Inhale steam so your looking at 60.00$ for thumper,, Acapella 70.00$and steam mask 25.00$ ladies use this for facial . If your between 10%20% 30 %up to 60% lung function this will clear your lungs quicker .It took me 8 Years I still use my Thumper acapella and the steamer when I feel tight in my lungs. and of course you'll need puffers that the doctor gives you . Exercises Deep Breathing perst lips The Above will help you alot .Read up on it do your homework . sorry for all the mistakes .