Everyone's septum is mad thin. I don't see why people get so scared of putting things in their nose. I've been putting drugs in mine for years and years now and never eroded away the cartilage. Granted, I've had a deviated septum since birth. If you're really scared about it, but want to put shit in your nose, just keep something like a neti pot around after you do some coke or something and rinse your nose out.