The longer the smoking continues, the more it permeates into finishes, walls, ceilings, floors, even insulation.

I have already removed all of the insulation which contained a good majority of the odor and will also remove any and all wood that it has permeated.  

You don't convince the tenant, she had unauthorized cats, and the cat pet caused the damages, are her expense,  You will never get the cat pee odor out, you may even have to get the sheetrock replaced about 2 feet up from the floors if the cat spray was that bad.after the sub floor is up, I would use Kilz and paint the joists before putting down new subfloor. and use kilz as primer before you do any painting.We flipped a cat pee house, had to remove the subfloors, and sheetrock for 2 feet from floor, the base molding, and door frames and doors the wood was so permeated with cat spray it was not an option to save.. we kilzed the entire area with this primer before painting.. 

It permeates their clothing, furniture, drapes, and carpet.

A clay soil doesn't allow water to permeate through it, it will run off, away from the house.  

Minimally, he is chain smoking marijuana every day, which permeates the entire building.I have verbage in my lease about illegal activities, but I frankly don't want to get into it with them about trying to prove my case.  

Dog and cat urine which permeated the sub-floor and required a complete rip out.

I have had to actually rebuild from the inside out on deals like this the smell permeated the 2/4s so we had to basically reframe the whole house one two x four at a time.

Through away all floor coverings and the cat smell still permeated the house!   

The neighbor above says it has permeated to her apartment, and she cannot stay there.