I'd never thought of that. Having read up the symptoms of asthma, I don't think it sounds the same, but you never know. When I get a cough, it's very clearly because there's stuff in my lungs, rather than being anything to do with my airways, but I suppose I could ask someone next time I get a really bad one. (The cough I've got at the moment is annoying, but nothing like as bad as many in the past.)