Should i do anything? ?

maybe respectyour parents wishes? If they don't want you going over there then don't go over there. Your friend has probably gotten used to having a smoker in the house so she dosn't mind smoke. As for the drinking, you can't do anything unless you know that he did something to your friend, which you don't. But if something bad does happen and your sure of it then call the police. But for know just respect your parents and make sure your friend knows you love her.