I'm new to COPD my 62 year old father was recently told he has a lung function of 47% is that the same as Fev1? Also, if I can get him to quit smoking does he still have a few years ahead of him? He currently has no issues breathing. He doesn't get out of breath while moving at all. He can walk around all day with out being out of breath or on oxygen. He has had this condition for 4 yrs that I know. But he would never stop smoking he smoked around 3 packs/day. Only last month did a Dr. prescribe medication for him. He is attempting to stop smoking. In the last 2weeks since seeing the Dr. he has cut back from 3 packs/day to a 1/2 a pack/day. He is attempting to quit all together. If he quits all together and takes the medicine prescribed is there a chance his lung function may improve some since his lungs won't be as inflamed?