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.