The Smell of Data

In our digital age, technology has been taking into account human senses, enhancing them, transcribing them to an immaterial world of pixels, be it through VR, haptic feedback, or bone conduction. Yet, taste and smell seem to be left out. Is it because it involves a complex chemical process? Or because since the 1965 Smell-O-Vision hoax (or even Google Nose for April fool’s 2013), it is considered a bit of a gimmick?