Hi thanks for contacting HCM... If your cough still not improving than digital chest x ray and spirometry (pulmonary function test done for further work up ) To detect causative organism throat swab or sputum collection done and send for culture report ... According to which drug given..... You have smoking habit ....So it can lead more cough production ... It is better if you can get rid of smoking habit .... Meanwhile if trouble some dry cough present than codein syrup given and if cough with mucous ambroxol syrup can be used ... Your physical examination also necessary with auscultation also ... Avoid excess fried food and spicy food as it will irritate respi mucosa. . Hope your concern. Solved .. Take care . Advise : pulmonologist consultation for examination...