Seems up to 70% of the cocaine in Los Angeles has been cut with levamisole, which is used to deworm livestock. The result of sniffing or smoking it? Your face rots off. YOUR FACE ROTS OFF, PEOPLE. Dozens of patients in the Los Angeles area have recently developed "purple-colored patches of necrotic skin on their ears, nose, cheeks and other parts of their body and, in some instances, suffered permanent scarring after they had used cocaine." Noah Craft, MD, PhD, of Los Biomedical Research Institute says, "We believe these cases of skin reactions and illnesses linked to contaminated cocaine are just the tip of the iceberg in a looming public health problem posed by levamisole."