Hi doc, i am having a persistent dry cough for almost 6 months from now , i have consulted a gp four months back and he prescribed an inhaler . The cough goes aways within two to three days after i started to use the inhaler, but it reappears after two weeks . Its not getting any worse or its chronic but itz not getting cured anyway , and it comes mostly in night . forget to say , am a smoker , just one or two daily . What might be the reason for this ?