Asthma attack is often triggered by cold, allergies, pollution, emotional factors, and other unidentified factors. ??? ??? ??? Chronic Bronchitis Is defined clinically as a persisten cough that produces sputum matter that is coughed up from the respiratory tract, for at least three months in two consecutive years. ??? ??? ??? Emphisema A pathological condition of the lungs marked by an abnormal in