Welcome to WinDrivers Huongtram. I once had a client with this situation and he also had the walls of his apartment in the same condition. (It was bad) I ended wearing a mask to work on the PC as it is not healthy for you. After 4 times of this, I figured it was not worth it not to mention any electronics exposed to smoke like this will start having failures. Hard choice since it is your mother-in-law. You might want to show her the inside and say "this is your lungs" and let her you know you care.