I wish I had more input...!!!!!?

Take her aside and tell her what she is going to end up as if she lets peer pressure get the best of her.She is your sister and you have the right to be worried about her.SHE SMOKES and her dad knows!This is a horrible situation,and it can really influence the women she becomes,this can make her or break her.You may be the only one who cares to help her.