@Inna22
All I can say is this approach by the guest for your properties, is emotional blackmail, pure and simple. Nope, nein & nyet! Don’t give an inch…….
However, due to having guests ignore my no smoking policy (any type including vaping or other e-cigarettes) we have discreet stickers on the external glass entry doors and in our courtyard.
I always ask at check-in and if there is a smoker or not, state the only space is at the back corner of our backyard, “see the umbrella and chair, there is an enclosed ashtray that must be used and emptied. We cater for guests who can be sensitive to smoke, and as longtime reformed smokers, we can’t handle the smell either.”