Here's my question. I've got a character who has a father and a brother that are gambling addicts. The character himself is not addicted to gambling, he wasn't fond of his father and despises his brother. In my head, because of that thing that I read somewhere however long ago it was, I have it worked out that instead of gambling, what he struggles with is smoking. He quite nearly 7 or 8 years ago, he had started during a very stressful time in his life, and whenever stress like that comes back, he starts up for a few days, but can kind of functionally quit for a little while, but it comes back. So it continues to go back and forth, and he does struggle with it.
While I could pass it off as just normal reaction to the nicotine in cigarettes and the stress, does the addiction model/idea make sense and has anyone else heard that and can comment? Should I go with that explaination, or scratch that and go with the second one that doesn't have to do the addictive personality? What do you guys think? There's a possibility it may not even be explained that way in-character, but it may just be a reference for me...either way, I'd still just like some ideas. Thanks.