Tom Brady could far outearn every NFL player in endorsement money, but he chooses not to.
The average person puts on around six to eight pounds when they quit smoking. Some people may put on more-even up to 30 pounds. Most people return to their normal (pre-quitting) weight after just one year. But, you would have to gain almost 100 pounds to put the same pressure on your heart that smoking causes.
For me it's just a matter of discipline. If you quit the habit of smoking, that means you are making a good start to improve your life. We all know that smoking can really bring your health a lot of negative effect and it has to stop. Gaining weight I think is another issue.