I don't know all the details of life with your kid, but I don't think I would make a huge deal of it if it were my kid and my kid seemed to be happy and doing well in other aspects of her life. Not to say I would encourage her, but it isn't anything I didn't do as an older teen and I wouldn't want something like marijuana use to drive a wedge between us. Now if my kid was doing poorly at school or seemed to have social issues, that would be a different situation.