Holy hell! First of all, say no to drugs! Doctors are warning cocaine users about a serious side-effect associated with cocaine use. While it's not as serious as say, death, this is pretty serious. Doctors at Los Angeles Biomedical Research Institute say drug dealers are cutting cocaine with levamisole, used for deworming livestock. They say two-thirds are cocaine in the US contains levamisole -- which causes damage to blood vessels under the skin that results in the rotting. At least a dozen patients have developed serious skin reactions and six users developed purple-colored dead skin after snorting or smoking the tainted drug. Say no to drugs!