It seems that "impossible" is not the right definition to use when we talk about technological progress (could anyone think 100 years ago that in 2020 people will be able to send animated color pictures to each other in a second? Hardly).
Most likely, it is only a matter of time and the idea of implementation, for which a conditional "bank" of flavors or a device that could decipher such messages from one person to another may be useful. When this will happen, it is impossible to predict: scientific discoveries often come from where they were not expected, in addition, people who are engaged in such projects rarely talk about their work.
First, you need to understand what a smell is: Smell is a specific sensation of the presence of volatile odoriferous substances (VAS) in the air, detected by chemical olfactory receptors located in the nasal cavity of animals and people. wikipedia.org
Such a device requires a bank of various materials to be released into the air, in fact, it requires a whole chemical laboratory, operating with raw materials and turning them into a finished product. The creation of such an apparatus with existing technologies is a very difficult task, and even if it is created, its dimensions can be very immodest. Although it is not difficult to create a device that reproduce smells according to a certain scenario w3bsit3-dns.com only in the limitations of such a device. Perhaps it is possible to create such a device, but which would work on a different principle - it would deceive the human brain by creating the illusion of a particular smell without the use of various chemical compounds.