I am a 28 male. I am a former heavy smoker, I quit 6 years ago. Even before I started smoking I have always been quite a heavy breather and always struggled with breathing during exercise, though I was never diagnosed with asthma or any other condition. Since December last have suffered periodically with chest tightness, usually at work, not during exercise, which was usually once or twice a week 5 a side football of decent intensity for 1hr+. I heard of someone I know having copd so of course I went and looked it up and convinced myself that I have it. I do sometimes feel a little short of breath after climbing stairs, though I normally run up them. In the last 2 weeks I've been off work, so I am noticing myself being conscious of my breathing all the time. Not necessarily short of breath, but aware of it. If I am busy, I forget about it, until I sit down idle again. I have upped my exercise routine, and I have ran 3-5 km 6 times in the last 2 weeks. I can't imagine I would do amazingly well on a spirometry test, if I practice the technique I've seen, I run out of puff pretty quick. I am hoping this is in my head. What are your opinions?