Hello You developed cough ( dry ) , that forced you to stop smoking , you took a right step in right direction. Since you were a chain smokers and this smoking produces allergy , hence you developed asthmatic allergic bronchitis . Patient develops typical sound in lungs ( airways ) either during inhalation or exhalation due to smoking or other allergen particles. These ( allergens ) produces bronchoconstriction and this produces wheezing and cough . If infection aided this produces phlegm ( expectoration ) . When such patient visit my clinic I prescribe them monteleukast+ bambuterol tablet once or twice ind day till complete relief. Dextromethorphan + chlorpheniramine maleat syrup also advised. Since this is a prescription drugs so consult your doctor . Good luck.