We also do not accept smokers, as the cost of removing smoke residue after move-out can be substantial.The lowest cost option is to work with a property manager with a track record of selecting reliable tenants for the first year.

[2] Will they pay for them--not just the initial lease term, but give up their beer and cigarette money year after year?

The back apartment I occupy was a complete filthy cigarette reeking gut job. 

Basically you just plug it in your car cigarette lighter (or whatever they are called now) and it will track everything and include a detailed map. 

Now I can see them, less cigarette smoke comes on my side, I can’t really hear them anymore and they really don’t hang out outside as much anymore because they were outdoor living to harass.

As for CYA, plan a quarterly inspection where you notate the secret cat and and the cigarette smoke.  

Treat it the same as cigarette use.

And I have the feeling the previous owner was a smoker. 

It wasn't nearly as bad as cigarette smoke.

I’ve been getting complaints from one of my tenants in a triplex claiming she smells cigarette smoke in her house.