It would seem that most divorces end up with using the kids as weapons against each other. That is why I recommend that parents let their children raise them. It might help them grow up (the parents that is).I smoked for many years when I was younger and never once in front of my kids. I had a heated workshop with cable TV for that or went for a walk etc etc...
That said putting the kid in the middle of a parental dispute is just wrong!