Long term smoking on furniture, on the walls, etc., the accumulated tar with what can be decomposed

This can only be done before painting the wall, sanding with sandpaper, plastering putty, this is a must, otherwise there is yellowing, and when the putty is dry, look at the effect, once it is not ideal, then a layer of putty, and finally brush the wall paint twice. As you said, wait for the wall to dry and see if there is still a tar smell, and pay attention to open the window for ventilation. Try some laundry detergent or lye water at home.

As long as the walls and ceilings are covered with new paint and cleaned, then clean up the unused household and open the windows for ventilation for a few days, and gradually there will not be so many unpleasant smells.

The residual smoke smell, you can put white vinegar and activated carbon in the room, and this smell will be deleted naturally. The most important thing is to ventilate.

It's good to buy some cleaning products that remove heavy oil, such as a blue moon, and Mr. Wittmann.

Sandpaper sanding, putty, this is a must, otherwise there is yellowing, and when the putty is dry, look at the effect, once it is not ideal, then a layer of putty, and finally brush the wall paint twice. As you said, wait for the wall to dry and see if there is still a tar smell, and pay attention to open the window for ventilation. Try some laundry detergent or lye water at home.