For example, if there are original hardwoods, try to restore and re-stain those.  

But the tenant knows you're going to keep the deposit so he doesn't pay his last month's rent, he doesn't clean, and you discover an additional $600 in scratched doors, stained carpet, etc.

It stains, so you can't put it on anything that is porous or light colored carpet.

They estimated $98,000 for the job and wrote this, basically saying that it's impossible to fix without also replacing the drywall and insulation, and that chemicals and paint would not be enough:"The odors and residue from the smoking are very apparent and appear to have permeated all areas of the Residence to such a level that these odors and residue, that is oil based, cannot beremoved by means of scrubbing with a detergent solution, application of a deodorizing solution, and application of a stain blocking type paint. 

Giant PITA and as soon as you dust them they are full of feathers or hairs or bits of whatever you use to dust them with...and God himself can't help you clean them thoroughly if someone gets a stain up there or squashes a spider.

We repainted the whole unit, everything was honey oak wood-wise, so we stained the doors, updated the hardware, stained the windows, and painted the fireplace and trim white.

And then get landlord insurance and a flood certification.I'd have a plumber scope the sewer line (blockages, cracks) and look for any nasty weak spots in the house in the plumbing (mold, water soaked walls, dry rot, termites, stains) just so you know what you are getting into.

You won't need to stain or paint it. 

@Geoff Kohl I was planning on staining.. so would you opt for untreated boards then? 

I inspected the property with my realtor and we found nothing alarming (no mold, no stains on walls or ceiling, checked plumbing and it all seemed to work fine)3.