Why are the lymph nodes below my jaw on my throat swollen?

On both sides, right under the hinge of my jaw, my glands are swollen. They have been for about 2 weeks. I went to a medical clinic and had some blood test done but the nurse practictioner told me the only thing they reveal is that I have a low vitamin D level. I recently quit smoking, so I wonder if my body is gathering the toxins and chemicals and storing them there to rid of them. In that case, it seems it should be a good thing. Should I be worried, or do you think I'll be fine? Good educated guesses please. :)