Well, I read through the thread again and I think I found my problem. Like an earlier person who was dealing with forest fires and poor air...There was no wind yesterday...damp, and still air. My neighboor burns wood for heat and the smoke just seems to settle in my back yard. There is usually a breeze to blow it away. I went to bed and started wheezing. Took alergy meds and gone. Im sure smoking doesnt help but in this case with poor fresh air I was smoking 24 hours.