I once quit for 3 weeks + but seemed to acquire the eating habits of a swarm of locusts. In the end people said, "Please, we don't want to eat anymore, what's happening to you!" I wasn't gaining weight but I think they were stuffed because I felt it had to be a social event. In the beginning they gladly joined in but...
And my wife told me to go back to smoking as I was snapping more than usual.