People love hardwoods and if they are clean and smooth they are very forgiving about any "character flaws" such as old water stains or cigarette burns.

The unit was completely redone a month ago and I have reason to believe the tenant is smoking cigarettes inside and now not paying.

These folks practically live at fast food joints as well.Throw in 2 packs of cigarettes a day and a case or two of beer and a bag of weed and voila, continued poverty.I could go on and on, but you get my point.Gary

I live in Massachusetts.  This is a small, 2-family house. (~700-800 sq ft per apartment)

Make no mistake in that the smell of Aldehyde is like no other in that once you have had a whiff, not unlike ammonia or skunk (think marijuana cigarette smoke), it's definitely a strong scent you will not soon forget.

If I owned single family (I don't) I'd consider dogs.If you think someone might be a smoker instead of asking if they smoke ask them how many cigarettes they smoke a day (picked that one up on the forum).Check their social media - if you see photos of a dog or cat that's significant (could be a parents' pet so use your best judgement) or photos of them smoking and you'll have your answer. 

Then inspect if they fail to file for eviction. if you didn’t smell cigarette smoke either they are vaping inside (just as bad for property damage), or if you smoke you wouldn’t be able to smell it sadly.  

I bought a better one, $300 i think, and ran it multiple times to mitigate the home from heavy cigarette smoke.

Cigarette smoking caused the fire. 

The tenants who live in the unit next to mine complained of an odor that smells like stale cigarette smoke in their apartment.