I have had COPD breathing difficulties for some time. In the last 3 weeks the breathing problems took a major turn worse.  I ended up in the hospital and came home with oxygen.   Four weeks ago I had some breathing difficulties but was riding my bike 6 to 10 miles a day. I an a 76 year old male who smoked for over 40 year.  I quit about 18 months ago. I am new here it looks like an excellent site.  Thanks to you all.