Back in the day when I was exploring a lot of VR potential, there was a company that made a computer-controlled scent device. With some basic chemicals they were able to reproduce thousands of scents.

Hmm, let's see if they still exist: Digiscents, Inc. I still have their "iSmell" t-shirt.

Nope. Looks like they were a dotBomb. Oh well. Cute idea. They demo'd it at CES in, oh, probably 2000.

Forget I said anything.