Recently I came to hyderabad for my business trip. There was a climate change. I am a smoker for last 8 years. 4 days back I had too much cold drink and that night I realised cough as it was coming in small quantity in white colour.I was also getting a bit pain while coughing that night. But next morning there was no pain but Instead I realized I am suffering from shortening of breathe. I have to breathe deeply once in a while to ease my breathing. No pain in chest...but I can feel a bit congestion in my chest. My question is...Is it due to cough or due smoking habit...is it a serious issuee such as asthama...or any serious lung disease. Pls ans as I am very much worried.