I lost 25 lbs the first year I started smoking heavily.
At that time, I also cut back enormously on drinking, quitting entirely for several months, and stopped going out to the bars entirely.
I also no longer have as high a stress level, and no longer get those jittery snack attacks.
Finally, I have succumbed entirely to the munchies and pretty much plan meals and smoking together so that when I have the super munchies, dinner is already on the stove! Let me tell you, it has made my cooking pretty creative and fun!