My issues were cigarette smoke.

Every time I would show up she would be out on the front porch smoking a cigarette.

Did you go find them to let them know about their statutory redemption rights and that you would help them out with that so they wouldn't lose their property and no "mean" investors would profit off their pain, or did you run around feeling great about the deal you bought and telling your buddies about how you just got a "smoker" of a deal?

But I had a smoker unit that I bit everything and it has held up so far.  

A red herring is when you use an unrelated statement that is true to divert attention from an argument.People who smoke cigarettes use this type of argument all the time.

Our only hope may be to target the right audience (for long and short term rentals), "Pot Smokers Welcome Here"!! 

After entering the house at the request of the tenants for some basic maintenance I find cigarette ash trays, hookah pipes and water bongs. 

That is like saying if someone next to you is smoking a cigarette that you will get lung cancer.

And in any rooms that have wall stains and odor from kitchen grease or cigarette smoke, do you like to also specify in writing any extra steps you expect them to take BEFORE painting those areas?

He smoked 2 packs of cigarettes a day inside which left a thick layer of nicotine on the walls.