Hi Moldie:About 5 years ago I came down with a chronic cough that stayed with me for l-l/2 years. I mean everyday coughing. My family and friends thought I had caught something serious. The doc sent me to specialists and I had scopes down my throat, lung, breathing tests. They thought I had asthma or maybe an upper respiratory infection, so I went the antibiotic route. Nothing helped. The coughing got so bad that it would make me vomit. I had tuberculosis as a child, so I was concerned that it might have come back, but they tested me and everything was ok. Then one day it disappeared and hasn't come back. I found out today at my yoga class that the new area that I moved to is smog capital of Canada. Interesting, eh.