I quit smoking several years ago and managed to do it without gaining weight.
First, I told myself that I could smoke on vacation. I had one planned a few weeks away and it helped me to know that I could smoke if I wanted to, but for a limited amount of time, did something for me mentally.
Second, I started walking. Every day you don't smoke, exercise gets easier. Noticeably easier. It's amazing.
Third, I taught myself to knit and ordered some patterns and pillow cases from
www.sublimestitching.com. Because embroidery? Is super easy. It works up fast. It keeps your hands busy, but not so busy you can't also watch tv or talk.
Fourth, clean everything. Get the smell out of your house. Once you get the smell out of your house and clothes and car, you will start to smell it on others, and it's so embarrassing to know you used to smell like that. I think every smoker walks around thinking it's all the OTHER smokers that stink, it doesn't stick to them. Yes, it does. Smokers smell like stale smoke. When all your stuff and your home is clean and you haven't smoked in a while, you'll eventually come across a jacket or something that never made it to the cleaners...and you will be so glad you don't stink like that anymore.
Last, if you have a pack in the house, get rid of it. As long as you're keeping a pack in reserve "just in case" you're not really trying. You've already told yourself you're not serious and you're not really going to quit today.
The last two things that keep me from starting up again:
I had a baby. I NEVER wanted her to smell like smoke and if you smoke, your kids and even pets will smell like smoke, whether you know it or not.
My uncle had throat cancer. He had most of his lower jaw removed and most of his tongue. He lived for a year and 6 months with a treach tube and a feeding tube. Even if he had beat the cancer, he would've gone the rest of his life disfigured, unable to eat, speak or taste. He was willing to go through all that so he could live and see his kids grow up. It feels disrespectful for me to smoke after that.