I do not allow anyone to smoke in my house, and frankly OP, I am amazed that you are even considering this for a moment.
I am a smoker, have been for 30 years, but hell would freeze over before I allowed anyone to smoke in my house or my car, including me.
I have a friend who smokes in her house and honestly, her house stinks, I mean, really really smells bad, I have almost been sick on occasion by the smell. And before anyone says, I am perfectly aware that smokers smell this bad too
OP, You may not mind the smell, but I have a few questions for you.
Will it bother you that your friends or family wont want to come to your house because of the vile smell and the way it makes them smell when they have been round?
Are you aware that cigarettes are the single biggest cause of house fires in the UK? (Surprising since the majority of people ime choose not to smoke in their homes anymore.)
What message are you conveying to your DD by allowing her to do this? Possibly that her comfort is far more important than every other person's comfort and health in the house?
What do the other people in the house think?
Are you aware that by allowing your home to become a smoking zone, your DD's friends, many of whom may not have admitted to their own parents that they smoke, are going to make a beeline for your home to smoke in comfort?
Do you want to be seen as a pushover?
I can almost guarantee you that other parents whose DC smoke would not be smoking in their homes, so why do you want to be subjected to something that could harm you, and make you and your clothes/hair stink? You will smell like a smoker without being one. Your acceptance of this is quite bizarre tbh.