Now if you have a smoker regardless if the "smoke outside" you have to repaint everything.

If so, why is it different than dog ownership or smokers?

I just bought a property that had a smoker living in it for nearly 30 years.

If the previous owner was a heavy smoker, the smell *will* come back, regardless of primer or scrubbing. 

Here's a start:http://www.biggerpockets.com/forums/67/topics/78889-smoker-rehab-keys-to-success-with-tobacco-smoke--before-after-picsThere is another thread that is 3-4 pages that goes into a lot of other possible ideas, but in the end it comes down to lots of cleaning and the shellac primer.

I have specified ‘single, quiet, non smoker preferred’ in ad.

Heavy mj smokers are usually pretty calm.Also look at the setup of your yard versus theirs any way to rearrange things so it's not so intrusive.

Then I vacuum it up the next day.This is for fairly easy smells (probably not effective for indoor chain smokers or male cat gone wild).2) I like the Nature's Miracle for pet odors.

My primary residence was a smoker's house when I bought it. 

I had less luck with a house that had a heavy smoker.