8 XXX : NSFW_GIF

It is probably steam. It breaks up pretty quickly as it cools. Smoke would stay together in a column unless blown away by the wind.
Imagine filming an HD porno and the next 9/11 happens in the background. You officially have the best available footage of it and it starts with two girls eating eachother out.
There's a background?
If I was lucky enough to eat that I'd let the city burn too.
http://i.imgur.com/6NfmQ.jpg
Jesus OP. You ever been to a city before? That isn't fire.
It's more likely to be a restaurant, or maybe a small production facility and cold weather. I live near a shopping center with several restaurants and they all do this several times a day. I assume it's when they clean the grills or change grease in friers or something.
Imagine filming an HD porno and the next 9/11 happens in the background. You officially have the best available footage of it and it starts with two girls eating eachother out.