According to experts, hyperactivity, loss of appetite and sleep deficit are warning signs for cocaine abuse. Other hints include a white powder residue on skin or clothing, a runny nose, bloodshot eyes and dilated pupils. And most recently, pain associated with a bleeding nose – at least in the UK with its pound currency.

Snorting cocaine through banknotes is commonplace, but now the new 5-pound note is made of thicker plastic. And that's a problem for users who are cutting their noses with it. Painful and bloody, they complain about getting "Winstoned" now, referring to Winston Churchill's image on the plastic fiver.