Hi. I have recently noticed that under my chin is swollen. The time period is less than a month. I smoke about a pack and 1/2 a day. It almost looks like a double chin. When I look upwards.....you can feel a definte area that is swollen, and it is not small (about 3 inches long). Could someone please help me or give me some advise. I am worried that this might be cancer of the throat or esphogus.