They may also: 1  Have a combination of skin, hair, and eye color that is outside the range for humans. 2  Some different preferred environment to humans (e.g. mountains, caves, tundra, deep forest). 3  Some sort of crafting/building ability. Lots of dwarves have this trait. 4  Be Always Chaotic Evil, Always Lawful Good, etc.
Chronic forms of sinusitis are also thought to potentially be a cause of the condition. Whatâs most important to understand about black mucus in nose areas is that it is not normal. There is something that is causing the change in hue in the protective goo.
A common idea, amongst smokers and non-smokers alike, is that smoking causes tar deposits in the lungs. These tar deposits supposedly build up and cause the lungs to turn black, and it is believed that these tars lead to lung cancer,[1] and Cancer Research UK says of tar â a sticky black residue made up of thousands of chemicals that stays in the smokerâs lungs and causes cancer.