Little known fact. The lavatories on airliners still have a little fold-out ashtray set into the inside of the door. It’s the same ashtray as was there in the 1960s and is still required to be there by FAA regulation.
The thinking being that that’s the least bad place for an illicit smoker to dispose of an illicit butt. Far better there than in the trash can full of used paper towels, etc. Or down the toilet where the solid cig filter can eventually hang up somewhere downstream. And we don’t want them disassembling the pop-up sink stopper / strainer to drop their butt down there either; that plumbing is even more cloggable.
Both negative pressure smoking lounges and dog-relieving areas are becoming more common at airports all across the US.
One especially interesting smoking lounge at Miami International is an open-air bar in the middle of the terminal building belonging to TGI Fridays. You’re welcome to smoke in there as long as you buy a drink & don’t linger. They cut a hole in the roof of the terminal building so you’re sitting in this 40’x40’ space with the open air 3+ stories above you and a semi-permanent tent over the square bar in the center. When it rains, patrons get wet. Fortunately snow in Miami is very rare.
Sadly they weren’t quite inventive enough to make the tent look like a tiki bar, for which Miami is justly famous. Ref this recent thread:
If you switch to satelite view & look for the red thing just alongside