Have a really bad cough, could it be due to smoking?

Coughing: Smoking produces toxins and tars, and your lungs try to protect themselves by flushing it out with mucous. Irritation caused by the tars, toxins, mucous, or infected mucous will all cause coughing. Years of smoking can lead to cancer, which can also lead to coughing. You need to be checked by your physician to find and treat the source of the cough.