A 52 y.o. hard smoker complains of persistent cough with purulent sputum discharge especially in the mornings, dyspnea provoked even by slight physical exercises, wheezing chest, tachypnoe, general weakness. He considers himself to be ill for 12 years. The foresaid presentations appear 3-4 times per year usually after a common cold and have tendency to progress. What disease do you think about first of all?