Why do smokers get out of breath sooner than non-smokers?

Answer 1

Because the smoker's lungs are smaller than normal person. The lung helps us breath so the smokers need to breath quickly when they walk.

Because less of the surface inside a smokers lungs is able to absorb the air that is necessary as result of being covered with tar and other chemicals that are left behind every time smoke is inhaled. Boy I'm glad I gave it up.

Answer 2

Because smoke damages the lungs of smokers, filling them up with black tar like deposits which makes them less efficient than the lungs of non smokers.