I havent had one in a while. I first got one when I was 18. Now Im 34. I quit opiates on jan 13th, and nicotine on Jan 21. Does anyone know if quitting either of this substances can cause a cold sore to appear? I googled both and found that nicotine can cause a cold sore to appear within 1-2 weeks after quitting due to less antibacterial properties in the mouth. Can anyone confirm this?