What Causes Painful Jaw After Quitting Smoking?

Hi I have been smoking for 6 years, my age is 27, i have quit smoking cold turkey from past 15 days. From last three days i m experiencing severe Right jaw pain. Can you help me why is this happening? I used to smoke 6 ciggarettes a day, i m walking upto 5 miles a day as exercise and my heart beat is ok.