How to compare the condition of the lungs from a smoker and from a non smoker?

Blow cigarette smoke: Through a tissue and you will have some idea. That yellow color ultimately becomes darker, brown and then black, and your lungs are filled with it. Healthy lungs are pink, and even non-smokers get a few dark spots here and there from air pollution, but smokers have very dark and even blackened lungs. More importantly, the airways and air sacs are damaged and don't work to give us enough oxygen.