Want to say thanks for the advice given and remind those who posted that I understand the "my house, my rules" thing and restate one last time and I realize I wasn't completely clear in the original post, that it was stated as a "don't do it" once from my dad and more like random comments about it here and there from my mom. Also, if I could afford a place of my own, I would, but at the moment can't(only been back at home since May of last year).
When both of us have time, I will talk to my mom-the one with the big issue-and try to settle things out, not argue, just talk and show her the benefits and ask what she really thinks as my dad gave me this new rule while she was fast asleep and unable to say what she really thought. And if in the end, it's a no, I'll accept it, I will and as I respected the "no smoking in the house rule", I will respect this once all information possible has been given and each person understands a little better what's on mind.
Again, thank you to those who offered advice, whether it be here or elsewhere.