My parents are getting divorced and my dad who hasn't smoked in years smoked today. Im so mad at him i cant even stand the sight of him, What do i do?!??!

Arrgghh! I'm sure you are beyond frustrated. It is horrible to watch someone you love do something harmful to themselves.

As soon as possible, ask him for some time alone where you won't be interrupted. Then, voice your concern in a thoughtful, concerned manner, not accusatory. Remind yourself that people tend to revert to old behaviors when under stress. It doesn't mean he has started up for the rest of his life. Hopefully, it may just be a temporary reaction.

By letting him know you understand he is under stress, and you can appreciate what he is going through, he will be more likely to be able to "hear" you. Then, ask him to stop. Directly.

You also may be harboring some other angry feelings toward your dad related to the divorce. If you aren't in counseling already, it may be something to consider. This is a rough time for everyone in your family, and a good therapist can be invaluable. If you need the name of a good one, please let me know.