Q: It's already bad enough that I have to quit smoking, and now I have to fight weight gain. That's not healthy, either. Isn't that like giving up one bad habit for another? Is there something I can take to prevent this?A: It is very common to gain weight after you stop using tobacco. It may help if you understand why.First, smoking cigarettes creates an oral fixation. When you remove the cigarettes, that oral fixation remains. Tobacco also suppresses the appetite and decreases both...