"Todd's 1960 film Scent of Mystery (1960) delivered scents to the audience throughout the film using a more advanced process called "Smell-o-vision". Problems propagating scents in synch with the film and flushing the scents out between each showing led to Smell-o-vision's early demise." -via Wikipedia
In view of that historic failure I wouldn't be rushing out to buy shares in Smell-O-Vision companies quite yet even if the technology has improved. Full Story
I'm going to go out on a limb here, and predict the early second demise of Smell-O-Vision for this decade at least.
Smell-O-Vision, Cinema, Scents, Movies, Virtual Reality, Humor