You can fill bowls with vinegar or activated charcoal and place them in closed off rooms.

If they've been smoking in it for years this might not work but I mixed a solution of vinegar and warm water and wiped down about every square inch of walls and windows in a rental where it smelled very bad of smoke.

I have used a mixture of vinegar cleaner to clean the carpet and get pet smells out and it may work for smoke smells as well.

Either a water and vinegar solution or you can use a product called Nature's Miracle which can kill urine odor.

You will catch more flies if you use honey instead of vinegar.

It is a good deal considering the low level of risk, so I guess it goes along with the saying, "you can catch more flies with honey than vinegar."

It can penetrate into electrical outlets and cabinet crevices.We start with a white vinegar/water wash of every surface.

You catch more bees with honey, than vinegar. 

But before doing so, really clean the tiles and tub with baking soda and vinegar. 

I used about everything that was suggested on the internet: Vinegar, Peroxide, baking soda, bleach, combination of peroxide and baking soda, mouth wash.