A doctor who helps drug addicts overcome their addiction has warned of the growing threat of the notorious synthetic cannabis Black Mamba.
Dr Andy Ball, of Leicestershire Partnership NHS Trust, said a growing number of hardened class A drug users and street drinkers are turning to Black Mamba because of its potency.
He spoke after police in Leicester city centre issued a number of warnings about the now outlawed former 'legal high'– formally known as a new psychoactive substance – and its effects on users.
Officers say they have encountered people displaying extreme forms of distress and paranoia.
A man who fell ill in the city centre last month and later died in hospital is widely believed to have smoked the drug moments before he collapsed.
Dr Ball said: "Every single drug user has heard of Black Mamba and they will tell you that, of all the drugs out there, it's the one with the biggest reputation for being dangerous.
"Unfortunately a lot of the traditional drug users have started to use it. It's also a problem in the prisons.
"It is not just on sale on the internet or in 'head' shops.
"We are also hearing anecdotally from our clients that people are now dealing it on the street.
"I don't remember any of the other new psychoactive substances being sold by street dealers before and that is just another indication of its potency.
"It's also very cheap. At the moment, as far as we can tell, a deal is approximately £10, whereas the same amount of cannabis might be £25.
"People need to understand that one packet of Black Mamba can be entirely different from another in terms of its potency and, we understand, can contain opiates.
"They simply do not know what they are putting into their bodies."
"People who smoke cannabis can stop fairly easily, but people who try to stop smoking Black Mamba can experience extreme withdrawal symptoms."
City centre police have previously told the Leicester Mercury they are concerned about the growing number of incidents they and paramedics are encountering in which people have fallen ill after smoking Black Mamba.
Some of the substances have been outlawed under recent legislation, however others currently remain legal.
New laws are due to be introduced to ban other products, which come in the form of powders, pills or smoking mixtures.
Earlier this year, city centre police issued a warning about Black Mamba and other new products, which are formally known as new psychoactive substances, after a rise in the number of emergency call-outs to people who had used them and were acting in a bizarre, paranoid or distressed way.
A man who was found seriously ill in the centre of Leicester last month and who later died in hospital is understood to have smoked Black Mamba shortly before he fell ill.
It is understood the man had started to associate with a group of street drinkers near the Clock Tower in the weeks before his death.
Officers have also worked with trading standards officials to urge shops to remove the substances.
Black Mamba was classified as a class B drug two years ago.
Those found guilty of possession face up to five years in prison while people convicted of supplying it can be jailed for up to 14 years.
Like many of the new powders and smoking mixtures on the market, its packaging often describes it as plant food or "not for human consumption".
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