You have been smoking
moderate amounts daily for a very long period of time. Hence your concern of having COPD
You are also right that X-Rays may not be the best in detecting early COPD.
I suggest you consult a Pulmonologist
in your area. He will be able to do certain tests of your breathing (spirometry
) that can rule in or rule out COPD even in early stages.
In tandem, you must also actively consider quitting smoking as it is beginning to harm your lungs and giving rise to symptoms that could progress.