@Tj0
This can be a hard situation for smokers and non-smokers. I am a former smoker of many years ago. When we first started with Airbnb we allowed smoking outside of the apartment. We then had some guests who did smoke and followed the house rules. The bad part was even though they were smoking on the other side of our house; we could smell it in our area even with the windows closed.
Also, after the guests who did smoke outside left, the next guests (after a good cleaning and 3 days later) commented to us about the smell of stale smoke especially in the bedroom/closet of the apartment. Realizing that the smell of smoke is on clothing and items that guests have we have changed our house rules to no smoking anywhere on the property and suggest that it is best suited for non-smokers. The last several guests have commented to us that it was one of the positive reasons they chose our listing.
I don’t think you would want to advertise for guests who smoke, instead mention it in your listing in at least two or three places, that there is a smoking area just outside of the place to help alert potential guests who are sensitive to smoke. I don’t think it is fair they marked you down for that but guests are funny. I think it is nice to have choices for all when using Airbnb.
Your listing looks great, continued good luck.