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There have even been reports of zinc-induced anosmia syndrome, meaning a loss of smell, from zinc nasal sprays.

Although less dependent on smell to process reality than other animals, humans still need it and will suffer from mental health disorders when that ability is impaired or eliminated through a condition known as anosmia.

For congenital anosmia, researchers suspect a genetic link or developmental abnormalities.

There are also efforts to build neuroprostheses that would help people with anosmia detect smell again.

Even anosmia, the loss of taste and smell — considered hallmark symptoms of this disease, though that is changing — is a neurological disorder, a category of conditions affecting the brain and central nervous system.