Can someone be addicted to inhaling naphthalene balls?

Perhaps: Napthalene is a known cancer-causing substance. Seek medical and psychiatric help if you are intentionally inhaling this.

It is called moth : Ball addiction. It is primarily vapor inhalation but in some situations may include licking or ingesting moth balls. It is very dangerous. Mothballs are usually all active ingredient ; are composed of either paradichlorobenzene or napthlene. They dissolve from a solid to a vapor which is toxic. Inhaling mothball vapor = breathing insecticide. There are problems w acute ; toxic exposure. See http.