Smoking is sometimes seen as a fetish. Men, in particular, like to watch ladies smoke as it can look very slow and sensual, also the movement of the mouth can resemble the shapes they would make while giving oral sex.
An escort will tick this box if they are willing to smoke for you, or if they are a full-time smoker.
If you are not keen on the smell of smoke it might be a good idea to not see an escort who smokes. As you will be in close proximity and perhaps kissing, it might be an unpleasant experience for you. If you are a smoker, it would be polite to ask the escort before lighting up, if you are unsure if she smokes herself. Even though the appointment is your house, you never know if the smoke will make her feel uncomfortable or she may suffer from asthma.