Hi thanks for conacing HCM... Noted you have chronic dry cough and you are using montelukast for it... So you might have allergic cough.... For that try to identify allergen and allergy test can be done.... If you have allergy related cough then repeated congestive symptoms might occurs .. Repeated viral infection also can be the cause... Get your nose examined for polyp... If no allergy found by history and examination then smoking history ruled out.. Smoking can lead cough by irritation... If you have acid reflux disease associated with heart burn then omeprazole given with supportive are as it can lead cough ... Consult pulmonologist and get your respi examination done.. If needed spirometry and chest x ray done. It might reveal bronchitis or COPD like cause...and accordingly treated. Take care.