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It was revealed that some dealers offer one free wrap of cocaine for every five users buy – incentivising them to stick to one dealer.

Aimed at wealthy customers, the scheme mirrors high street coffee chains, with dealers even offering a “Deliveroo-style” service where drivers will bring the drugs to your workplace.

Buyers typically pay around £100 per wrap, which will earn buyers one stamp from their courier when they arrive at the buyer’s home or office.

The smiley-face image on the card, reminiscent of the acid house scene from the 80s, clearly suggests the dealers have a specific market in mind with the scheme.

It reads: “One freebie for every five stamps that you collect.”

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Harry Shapiro, of DrugWise, an online drug information service, told the Daily Telegraph: “The level of competition on the street means they have to offer an incentive to get their customers to stay with the one dealer.

“But this card also shows how there are two very different ends of the drug-dealing spectrum. At the one end, there is an offer of a modicum of support to the buyer.

“But at the other end, they are trying to beat the competition, and that competition results in violence on the streets.”

The drug culture in the UK, particularly that of London, has come under increasing scrutiny this week for its links to violence, as it was revealed London’s murder rate surpassed that of New York.

In 2018, 56 people have been killed on the streets of London in knife or gun-related attacks, with many more the targets of acid attacks.

As violence on the streets of the capital escalates, David Lammy is one of several who have spoken out against the trend.

Mr Lammy, MP for Tottenham, explained the £11billion cocaine industry has bred gang rivalry and wars leaving hundreds of young people dead.

He also claimed ordering drugs is as easy as ordering a pizza, suggesting police had “lost control”.

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He said: “I’ve had four deaths in the London Borough of Haringey since January, I've had as many knife attacks as there have been weeks in the year.

“There are parents, friends, families, schools traumatised and grieving, and there is absolutely no sign, I've got to tell you at the moment, of reduction in the violence.

“I’ve been an MP now for 18 years and I'm afraid what we're seeing today is the worst I've ever seen it.”

It is well-known there is a mounting problem in London with eastern European gangs selling drugs and involving themselves in turf wars.

Last month it was revealed that British jails held 726 Albanians in 2017, a figure that has almost tripled since 2013, with 312 behind bars for drug-related offences.

Furthermore, the problem in London is spreading elsewhere, with young people lured in as “couriers” to carry and sell drugs in small towns around the country.

This has seen heroin and crack cocaine consumption rise steadily in recently years.