Should I tell my mom I'm a fellow Ent?

So I know for a fact my mom smokes cause I caught her once and she flat oh told me. I smoke regularly but she doesn't know I do. It would be cool if she knew cause then we could smoke together and it be cool. I'm 18 and my moms really chi. However, I don't want it to become a blackmail thing. Or her completely freak out I I told her. Please leave some advice on if I should or shouldn't tell her. Thanks