Made from ingredients like industrial cleaning products and painkillers, krokodil is around a third cheaper than heroin and is known to cause flesh to rot off users. It it thought that over one million Russians are addicted to the drug. (Pic: Public Domain Pictures)

Whoonga is made from antiretroviral drugs (above) that are used to treat HIV, and are cut with detergents. It is said to be highly addictive and can cause internal bleeding and death. (Pic: Wikipedia)

Not for putting in water for a deep clean, these bath salts were only given the name because they look like the real thing. They actually provoke psychosis and violence and are blamed for the ‘zombification’ of users. (Pic: Rex)

With a chemical make-up similar to drugs found in bath salts, Flakka was billed as a legal high alternative to ecstasy. Users can experience hallucinations and it can cause permanent psychological damage and heart failure. (Pic: Wikipedia)

Previously legal, the opioid AH-7921 has been a class A drug since January 2015. Users can suffer gangrene or even respiratory arrest. (Pic: Wikipedia)

Perhaps most famous for being the drug made by Walter White in Breaking Bad, crystal meth was used during World War Two to keep soldiers awake and is one of the most widespread drugs in the world. It can cause anxiety and brain damage. (Pic: Rex)

Essentially cocaine in rock form, this drug was used by more than 10 million people in the U.S. at the peak of its epidemic. Users have died from heart attacks and the drug can also cause liver and lung damage. (Pic: Rex)

Users of this highly destructive and addictive drugs develop a weak immune system, muscular weakness an even gangrene. It was originally developed as a strong painkiller. (Pic: Rex)

Made using the nightshade plant, Scopolamine is highly toxic, with one gram able to kill 20 people. It is used as a weapon by criminals and can cause victims to lose all sense of self control. (Pic: Wikipedia)

Mentioned in various hip hop songs, purple drank is a mixture of sweets, soda water and cold medicine - containing codeine that can cause a woozy feeling to the user. Experts say that it can also cause more dangerous side effects like heart failure. (Pic: Wikipedia)