Dude, I remember seeing the glass smoking enclosure in an airport once. For everyone who was too young or not around at the time, I‘m going to paint you a picture. 

You’re walking down the concourse passing gates and food joints on your way to your gate. Your family’s with you because, ya know, patriotism in the face of terrorism hasn’t happened yet. You’re about halfway down the concourse when, on your left, an area opens up. There aren’t any seats in the area because it’s basically taken up by a big, glass room with a single door. There’s no seating in the room, so it’s packed with standing people. The air around you is crystal clear which means the pea soup-like haze in the glass room is…well, it’s jarring because it’s so out of place. 

I don’t know from first hand experience what those people smelled like when they came out, but I can imagine it. I’d probably ask to be re-assigned a new seat if I had to sit next to one of them.