I quit smoking last summer, but started on and off smoking (I acted like a raging biiiiotch the entire time from the neverending withdrawal I put myself through). I quit for real real in March, and I don't miss cigarettes at all.
I listened to the audio version of Allen Carr's
The Easy Way to Stop Smoking. It helped A LOT. It helped me identify why I smoked, and knocked down all the myths about smoking and my fears about quitting. The biggest thing was the social aspect. My mom, dad, brother, sis-in-law, and most of my friends smoked. My dad used to give me cigarettes, and social functions were torture. But I learned to pity them, instead of feeling jealous or like I was missing out. Because it's not like they want to smoke, they HAVE to. Knowing that changed it a lot. I don't even really crave cigs at all anymore.
It's mind over matter, and it's how you look at it. If you think of it like you're going to be missing out on something, or giving up something you love, you're going to be miserable. But if you think of it like "I don't have to smoke anymore! Or smell! Or cough!" then it's really quite easy. I also didn't gain any weight really (except when torturing myself with the on/off smoking thing). Journal your food, drink lots of water, stay busy and you'll do fine