The first is that when they lick their nose, they lick mucus all over it, making it wet and sticky,

they lick mucus all over it,

the predominant physiological effect of ozone is primary irritation of the mucus membranes."

"is primary irritation of the mucus membranes."

Now, usually the mucus moisturizes the skin in our nose, thus protecting the blood vessels in it.

Mucus is so useful.

A person with asthma has red and swollen bronchial tubes with a lot of mucus.

The tubes become much more swollen and more mucus is produced.

Mostly, the cilia and mucus in our respiratory tract trap these microorganisms.

A secreted fluid from their nose helps them smell by capturing scent chemicals in a thin layer of wet mucus on their nose.

and wake up dry mouth, dry mucus membranes,

Your lungs are like big inflatable sponges and have a filter and barrier; the cilia cells with hair-like extensions covered by a layer of mucus.

Tar particles land in the mucus and turn into a sticky brown substance that stops the dance and paralyses the cilia – allowing them to get deeper into your lungs to the alveoli.

Besides this, as a protective response, some immune cells also trigger production of excess mucus.

in a scent-proof cocoon of secreted mucus.