Smokers, like rabid animals, are usually confined to enclosed areas, away from the rest of us. The FRESH concept, designed for airports and other high-traffic areas, uses a "wall" of air to stop the carcinogen-laden smoke from reaching us normals.
The "wall" is actually created by colliding high and low air pressure in a spherical shape, keeping any harmful smoke within its boundaries. Fresh air is continually cycled through the interior of the FRESH unit so the smokers don't hotbox the thing. It was designed by D.K. Wei, and doesn't seem to be in the running for production, but it is definitely a cool-looking, functional way to reduce secondhand smoke as well as making smokers feel less like herded cattle. [Yanko Design]