Look up what's in meth. It eats through you. See it everyday. We call the sores crack mites. The poison has to push itself out of the body ( it's not sweat ) and being tweekers, they pick at it continuously until it's all a seeping bloody mess. All of the fuels, etc. have to leave the body someway. Slumlord hit the nail on the head. Hate it but Heroin is really bad now also. That stuff is the Devil.................