Conceptual wise, it’s not new, just like wireless power transfer. But to make it a reality will be pretty amazing.
Actually, just a scent generator is amazing enough. For couples living far apart from each other, one can release the perfume or shampoo that the other uses to simulate the “presence” of each other. Kids can do the same when they miss their parents.
Bbarn, in my family we call those grenades. Cuff it, close it, and smack it in their face. Pretty immature, but always funny to catch someone off guard.