When I was looking for something that explained the reason for the damage better than I could, I came across a report saying that she was doing ten bags worth daily. Do that regularly and damage is bound to occur.
I had the cocaine-dusted packing when I had an operation on my sinuses and deviated septum (from a hockey stick to the face at school and a rifle sight to the face at university!). Later, I worked for the police and had great delight in saying in a lunchtime conversation with senior officers "well, the only time I've ever had cocaine...."