Often times when I have tried to quit smoking in the past I would get intense sinus headaches and nasal congestion about a week or so
after trying to
quit, but it seemed to go away when I started
smoking regularly again. One time when I was trying to cut back from smoking 2 packs a day, down to only 1 a pack a day, I got the same wracking headaches every afternoon that stayed with me for weeks, even months, before finally getting better.