Why when i quitted smoking i started to gain weight? it was just a week. i ate healthy (i'm vegetarian), dieting(i don't eat much) and some exercise.

Quitting Smoking: It is very well known among the population who has quit smoking and those of us who care for them that weight gain is common early on with quitting smoking. Many smokers use this excuse to start smoking again. But, in almost every study done on this phenomenon those who remain off of cigarettes their weight returns to normal within a few months. Please don't start smoking again.