馃尗锔廠MOKE TO PIG馃惙
In the Edo period it was common to use smoke as a simple mosquito repellant, but as most buildings were made of paper and wood many people in built up areas were concerned about naked flames.
Boars, as familiars of the fire deity, became linked to fire protection.

Woodblock print a young women beneath a mosquito net.
Image thanks - https://ja.ukiyo-e.org/

Woodblock print a young lady hanging a mosquito net.
Image thanks - https://ja.ukiyo-e.org/

Woodblock print of a baby Wu Meng fanning smoke to keep mosquitoes away from his sleeping father.
Image thanks - https://ja.ukiyo-e.org/

Woodblock print of a fire raging in Edo.
Image thanks - https://ja.ukiyo-e.org/
In addition to this connection between boars and fire, it was believed that the thick, hairy skin of the animals helped protect them from mosquitoes, and so these ideas maybe inspired potters when they came to create a holder for incense coils...

A banner featuring a leaping boar at Goo-jinja (in celebration of the Year of the Boar).

A sea of omikuji holders in the shape of boars at Kennin-ji's Zenkyo-an.

A boar shaped monaka (a wafer filled with bean jam).

Boar statue at Goo-jinja (the animals are the familiars of the enshrined god).