Snorting various drugs has become a common way of using them. The medical term for this is insufflation. People do it because it allows the drugs to enter into their systems faster than other methods. It's possible that you have also been participating in snorting certain drugs. You may be doing so without realizing the dangers of it.
From Page: The Dangers of Snorting Various Drugs: Your Nose Deserves Better | Category: Drugs