Read a wonderful article on the brief history of olfactory stimulation in marketing. From Smell-o-Vision Photo by Santa Clara County Library 

to smellizing to the latest scent-emitting ophone app,

 Photo by Vapor Communications

it covers a few milestones in scent technology. Although this is in no way exhaustive of olfactive technology in the 20th and 21st century, if you’re curious about the next level of immersive sensory marketing and media, this is a must read.