If the lump in your throat
tightness show up again (or dry coughing or excessive mucus in
for no apparent reason), get yourself to a doc, fast.
IMPORTANT: You'll want to discuss all of this with your primary care physician before you do anything else, however, as what you're displaying may be signs of something more serious, particularly because of the smoking. (This isn't too likely, however. Still, I wouldn't take any chances.