We have cameras for recording what we see, and microphones for recording what we hear, so why don't we have smell-cams to record what we smell? It's the only sense that doesn't require direct physical contact that we don't have a recordable medium for. Scratch & Sniff is the closest thing, and that can't be stored on a hard drive.
Of course, maybe someone has thought of this and invented it, but it isn't selling because of the amazing annoyance potential. Like, when you're really hungry and stuck at work, your friends could email you the delicious aromas from their mother's cooking. Or, when I wake up covered in cats, I could email you some cat farts for your morning.
But think how much more engrossing television would be with aromas. I think I would never turn off Food Network if there were aromas. But then, on the flip side, I could never watch Nickelodeon again.
(truth be told, I know why. It's because although you don't have to be in direct physical contact with the item producing the aroma to smell it, you *do* have to be in direct physical contact with the smelloons (that is my own word) to smell something. Whereas, video and audio are just a result of waves.)
Still, come on. Smell-cam.