Had the vice from the age of 16 to 33. In the final 5 years I was smoking a pack and half per day, starting early in the morning before breakfast.
A friend handed me a book about quiting smoking and while I was reading it I smoked my last cig and I never looked back. I didn't gain weight, I was able to consume the same amount of alcohol than when I was a smoker, everything is better.
If you don't want to quit smoking you won't be able to. If you're serious about it, because you realize smoking doesn't really serve any purpose or gain for the quality of your life, you will find yourself quitting inmediately.
It's been a year and the thought of going back to smoking sounds retarded. I wish you the best of luck, you can do it.