I'd look at the technology behind "Smell O Rama": http://en.wikipedia.org/wiki/Digital_scent_technology http://en.wikipedia.org/wiki/Digital_scent_technology I

I'd look at the technology behind "Smell O Rama": http://en.wikipedia.org/wiki/Digital_scent_technology http://en.wikipedia.org/wiki/Digital_scent_technology It's a gimmick they used in the early 50's, adding associated smells to movies. I'm not sure about on-the-fly smell creation though.