Users report it's so potent it can cause hallucinations, paranoia and bursts of aggression and violence. 'Monkey Dust' is a synthetic psychoactive drug, similar to 'Spice', which has already been linked to the death of a baby.
The drug is causing particular concern in Stoke-on-Trent, just down the M6, and there's evidence it's here in Greater Manchester.
Also sold under names like 'M1', or 'magic crystals' but actually it is derived from a chemical, cathinone, which is a naturally occurring stimulant found in the plant, khat.
Like Spice, though, what is actually in each deal is anyone's guess and consuming it is a dangerous lottery. Price and potency underlie why it has become so popular so quickly.
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