I have a smoker's cough without smoking- basically a flem producing cough. I have had this for over 2 months. I have been in one state half the time and another state the other half, so I don't think it is allergies. My doctor has prescribed, one after another,Singulair, an allergy medicine, and a Z-pak 5-day course. They have all been equally useless. I'm not sure which direction to go in, at this point.