@Leanne232 It sounds like the guest was taking the vaporizer outside to adhere to your rule, but felt like blowing out the door was a sufficient amount of effort. Sounds a bit lazy, but not something worth mentioning in the review when by all measures he was a great guest.
Instead, I recommend refining the way you communicate your smoking policy. If you just say "no smoking anywhere," smokers will simply improvise a workaround, but if you designate the nearest place where they can smoke (even if it's off the premises) they tend to comply. Even better would be to set up a comfortable smoking nook outdoors, with a bit of seating and a safe receptacle for butts. I'm afraid it's not realistic to cater to groups of up to 6 adults and have exclusively non-smokers as guests.
Unrelated, but you should immediately delete the text in your House Rules that says "no Ethnic foods," as this verbiage stinks of discrimination. What food isn't "ethnic" to somebody? If the problem that you're trying to solve is residual kitchen odor, it's best to require them to fully ventilate the kitchen during and after cooking; leaving at least a full day between bookings also helps. But if you're offering use of a kitchen, you don't get to micromanage guests' food choices - especially in a way that comes across as a racial microagression.
