im not sure what it could be however yea definitely get it checked out. Just dont over work your self because it could be a multitude of things. I understand your fear though, going through the same thing myself, you just gotta calm down and think ok...the doctors will figure it out. It could be a small as a bengin cyst or those really big deep in the skin pimples...i know i get these large bumps too and its just one of those and if you dont mess with it they go away. But yea get it checked cause you never know especially being a smoker. Note any other symptoms. Trouble swallowing? Any pain in the area? Hard chew? Fevers? Weight loss? Vomiting? Keep these all in mind when you go to the doctors. Note when you found it and how long you have had it. Dont mess with it though. touching it is going to possibly make it worse even if it is nothing to worry about. Good luck and let us know what happens.