Are these units worth it, and have you had good success with addressing cigarette smoke odors with ozone?

Vaping doesn't produce the same strong odors or lingering smoke as traditional cigarettes or hookah, which could be a more acceptable option for your tenant.

I'm just "grumbling"...   

Looking at my first property and there is a severely intense odor in the basement (concrete) and some slight orders on the other levels of the house as well (hardwood floors and carpet).

My question is, is there anything more I need to do to (i.e. issue a formal written notice of lease violation) in order to prepare for the possibility of keeping a portion of their security deposit to pay for eliminating the odor? 

So we want to make an offer on a house in our target area but it has brown stained walls and popcorn ceiling and a sting odor of smoke.

Abating the odor (tobacco and Marijuana) is costly and time consuming. 

That will bring odors and accidents.

There is some damage to the home (broken doors, nails and holes in wall, bad odor due to not cleaning (and cats I assume), and destroyed carpets. 

I had a tenant call and say that the water from the kitchen faucet tasted weird and had an odor.