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High school boys bathroom was basically a de-facto smoking lounge. It was banned but kids still did it. They occasionally cracked down, but the smell was permanent.

There was also an unwritten understanding that it was preferred the boys went out back to a certain door to smoke outside there instead and wouldn't get in trouble if caught.

"…had a smoking and non-smoking section"

You're younger than me if you don't remember before there was even that distinction.

I went to bingo years ago and there was a glass partition between the smoking and non, but it didn't go to the ceiling. So you'd sit in the non and just watch a wave of cigarette smoke roll over the top of the glass into your area... I only went once because of that.