The horrific cocktail of codeine, gasoline, paint thinner and alcohol that is krokodil makes it a contender for one of the most frightening and dangerous drugs currently available on the black market.
Dubbed "cannibal heroin", it literally rots users from the inside out, in most cases leaving addicts with a life expectancy of just a year.
Pictured below is a krokodil user's mottled, sore-addled legs, followed by some of the other horror drug stories we've come across.
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And we're not just talking about the harder stuff. Cannabis and magic mushrooms have also played parts in some of these unsavoury tales.
Just say no, kids.