Noun
(idiomatic) A place where powerful people meet to decide a matter in secret, often of a political nature.
Used other than figuratively or idiomatically: see smoke, filled, room.
Source: en.wiktionary.orgI always liked the smell of a smoke-filled room. I think it's a good smell. Dennis Franz
I can't stand light. I hate weather. My idea of heaven is moving from one smoke-filled room to another. Peter O'Toole