It may be heart burn and or indigestion. Do you have any other symptoms like fever, chills, nausea, etc? There any possibilities, smoking a negative contributing factor, if it continues to bother you or worsens please talk to a physician. Hope you feel better soon.
Maybe tonsil stones? I always felt like something was stuck at the back of my tongue or throat when I had stones. Use a mirror and carefully inspect your tonsils. Clean hands! Gentley! Or it could be all the smoking. Then you should quit :) feel better