In which country do you live? In Russia, for example, ventilation in restaurants is done very carefully and in compliance with the relevant norms. There is a powerful exhaust ventilation in the smoking room, and the flow is installed so that the air from the smoking room does not enter the non-smoking room. Sometimes separate outlets are placed, and an outlet between the halls; sometimes in the non-smoking room an outlet is placed, in the smoking outlet. The proper functioning of the flow and exhaust ventilation systems shall be checked by measurements, activated and provided to the verifying organizations upon request.
So come back from "your country" to Russia, it’s pretty good here. Especially if you are not concerned about how bad in your country", but in good faith to do your business.
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The Soviet joke:
The teacher tells the children about the good life in the Soviet Union.
“Wow, why are you crying?
I want to live in the Soviet Union :'(

How many years have passed and nothing has changed. Only the wolf grew up.