Does the place show an outside seating area or a porch? If it turns out that you can only smoke outside, if it has an area like that, would it be an issue for you to smoke outside?
I would think that if a host has indicated "Smoking allowed", but didn't specify anywhere that it was only to be done outside, it wouldn't matter, but of course it's never a good idea to assume things.
Did you read through all of the listing wording? Clicked on "read more?" It might be mentioned somewhere other than house rules.
I would actually be a little wary of booking a place where the host hasn't bothered to answer your message in several days.
@Mina787