I'm 62.I gave up smoking about a year ago.Soon after I was diagnosed as having COPD. Stage three apparently. When I was smoking I could swim in the sea and even have a go at amateur surfing. Four weeks after giving up smoking I suddenly couldn't walk more than about 50 yards without gasping for breath. I'm in about the same position now. This seems to happen to quite a few people. Has anyone got the answer please ?