Could smoking be the cause of this, and if so, what problems might there be if I don't quit smoking?

I have a cough that doesn't go away for months, shortness of breath and phlegm. I have wheezing. Could this be due to smoking? What problems can happen if I don't quit smoking?
Give me relevant answers.

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Pitchblue

Emphysema. Your lungs are being coated with tar from smoking. The tiny air sacs in your lungs get destroyed over time and causes emphysema. My father lost the use of one lung before he quit smoking. If it progresses to emphysema you will have to breath with an oxygen tank.