October 11 will be my one year anniversary as a non smoker, after 15 years of 2 packs a day.... did not gain a pound!!!! If you increase your cardio by 20 minutes, it makes up for the loss of metabolism (smoking increases your metabolism by 7%, so an extra 20 minutes on the treadmill will make up for this)... if you do this, you wont' gain weight.. unless you go nuts eating, but with the extra cardio, you help to curb your appetite as well... good luck all. i quit very cold turkey, and while it has not been hard yet... I know that i am a smoker for life and this will always be a struggle.. good luck!