Contrary to what many people think, ETS, also called secondhand smoke, is impossible to contain within walls.
Smoke travels and drifts.
It does not stay in the apartment, condo, or co-op of the person who is smoking. It has been shown to move through light fixtures, through ceiling crawl spaces, and into and out of doorways. It is legal for apartment management to designate certain apartments or all of the apartments in a building as smokefree. The apartments can be advertised as smokefree. People who smoke are NOT a protected group under California and U.S. civil rights laws.