I thought about a condition known as pica. Pica though is characterized by eating non-food items... sometimes thought to be because of a mineral deficiency... or an obsessive-compulsive disorder. But this is snorting, so I don't know if it applies.
Seek MEDICAL attention. I bet there is help for you, really. There is effective treatment for OCD and similar conditions. Snorting that stuff will hurt you, permanently. Please, go to a doctor
Mark