LOTS of WATER, if the sore throat keeps up change the base of your juice...I had to switch from PG (Propylene Glycol) to VG (Vegetable Glycerin) because of raw sore throat, lung pains, and coughing. Lot of good information in that link, best of luck to you!
We are all guilty though of a poor water intake.6-8 8oz. glasses per day..not to be confused with soda, coffee, fruit juices, etc, plain old water to keep all tissues (especially lungs) properly and adequately hydrated, especially in a stop smoking situation. Your lungs need moisture to properly clean out sticky thick substances such as tar. We are 90% H2O or thereabouts, keep hydrated!