The more cigarettes that a person smoked per day, the more weight he or she is likely to gain after quitting. Someone who quit smoking two packs per day may expect to gain more than someone who quit smoking only one pack per day.
Please note that these numbers are only averages. You may be above average or below average. Half the people who quit smoking gain less than the average 4-10 pounds. And, about one out of ten ex-smokers gains as much as 25-30 pounds.
Most weight tends to be gained in the first six months. Then, after six months many people start to lose the weight they gained as they adjust to being an ex-smoker.
http://www.smokefree.gov/pubs/ffree3.pdf
Congratulations on quitting btw
