Thanks for letting me in ya s group I'm at the end stage of COPD was told I had COPD bout two years ago but was not told what stage I was at. Four doctors and two lung doctors and a year an a half. Found a lung doctor that would tell me. Was I was at the end stage with 28 per send of my lungs. On oxegen 27/7 Haven smoked in a month. Can breath better but can tell I don't have the lung to us it.