  Exhaled breath can be used in retrieving information and creating innovative
communication systems. It contains several volatile organic compounds (VOCs)
and biological entities that can act as health biomarkers. For instance, the
breath of infected human contains a nonnegligible amount of pathogenic aerosol
that can spread or remain suspended in the atmosphere. Therefore, the exhaled
breath can be exploited as a source's message in a communication setup to
remotely scan the bio-information via an aerosol transmission channel. An
overview of the basic configuration is presented along with a description of
system components with a particular emphasis on channel modeling. Furthermore,
the challenges that arise in theoretical analysis and system development are
highlighted. Finally, several open issues are discussed to concretize the
proposed communication concept.
