The 1940's Bugs Bunny cartoon "The grey old hare", set in the far off year of 2000, coined the name, ("Smellovision replaces Television!") but there was a real smell-o-vision film made in 1960.
http://en.wikipedia.org/wiki/Scent_of_Mystery
John Waters also released Polyester in "Odorama", where a number flashed on the screen to tell you which part of a scratch and sniff card to use. I think Criterion reproduced that for the Laserdisc!