Certain lung-related clinical symptoms in cigarette smokers might be due to defects in the function of a protein implicated in cystic fibrosis, according to a study. Many smokers suffer from chronic obstructive pulmonary diseases, an array of conditions similar to cystic fibrosis, caused by the defective function of an ion-transporting protein called cystic fibrosis transmembrane conductance regulator (CFTR) in the airways of the lungs
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