There are misting products out there that claim to neutralize smoke/pet odors chemically but I haven’t tried and yet. 

We have a tenant who's been an amazing pain:1) Smokes pot all day and it fills the entire building of pot, tenants complaining.2) Let's other people stay in his apartment when he's not there.3) Overloaded the power line to where the utility company had to come out and shut all utilities off for all units in the building for the last five days while they investigated the problem and found the solution..

Floor looks old so may make sense to stain dark color to hide 

You can still add no smoking or vaping inside the house. 

I really hope I am wrong and its just a smoking deal!

One more complaint came in yesterday from another tenant who smelled cigarette smoke in the common area.

@Douglas GoldsteinHoly smokes!

Anything else anyone can think of from that perspective to get rid of smoke odor? 

OK I'll bite.These are good tenants;Pays on time, takes care of property, knows how to close a door, somewhat handy, realistic, responsible, clean,  respectful, quiet, doesn't smoke, contacts landlord about any requests, knows his rental/financial history and is prepared, is humble and as sage as a shaolin monk.

Floors were all sanded and stained with dark finish with 3 coats of poly added.