They don't smoke in the bedrooms, and use things like air fresheners, candles, incents, perfumes, etc. to mask the smell throughout.
I have however seen some ladies smoking in the kitchen or living areas, but they make a good effort to keep it from interfering with business.
If it is a serious issue, I would recommend Eden's over Sabrina's. I have gone to Sabrina's on occassion, and can smell the smoke at the door and hear them cleaning up inside and spraying air freshener, etc. Doesn't bother me in the least. Just an observation due to your question. I find it less noticeable at Eden's.
You could probably also advise them when making an appointment so they can accomodate.