I have asthma had it for 30 years I also was told last year I have a lung problem called Sarcodiosis which is rare. This causes me to have a cough I have tried the lot over the years,but the only thing that stops me is my late mum's remedy that she used to give me when I was small, it's horrid but works for me it's butter vinegar and sugar just mix an ammount to fill a table spoon and warm it to swallow. Oh and have a mint ready to suck after. Good luck xx