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 [b]relevant[/b] answers.

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DrWatson · 70-79, M

My mother-in-law was a chain smoker and had all of those symptoms.

Eventually she had to go into a nursing home where she could not smoke. And in time, that cough went away.