Only available in Russia, it's a heroin substitute, and it essentially eats your flesh.
'It was given its reptilian name because its poisonous ingredients quickly turn the skin scaly. Photographs of late-stage krokodil addicts are disturbing in the extreme. Flesh goes grey and peels away to leave bones exposed. People literally rot to death.'
These pictures/video of the sufferers are NOT FOR THE FAINT HEARTED