I was a smoker for four and a half years. Six months back, I got my chest X-ray, and my reports were normal. Then I was an intermittent smoker, and I had a cough. It was dry. I did not care and did not take medications for it, but within a week, it increased. So when I took the medication, it was gone but not totally. Since then, I have been coughing once or twice a day. But I have not been taking proper medication and rest. I am always on tour. I ate curd and caught a cold yesterday. When I cleared my nose, blood came in, so I coughed on purpose to see if it was from my lungs, but no blood from there, and today also, the same thing happened. That is, I cleared my nose, and blood came. What is it? Is it cancer? I am scared.