Psychoactive substances, known as legal highs, are getting stronger and sometimes more addictive than some illegal drugs, a BBC Wales investigation has found.

The synthetic versions, which mimic the likes of amphetamines, cannabis and heroin, are sold on the internet and on the high street.

Mephedrone and benzofuran have been banned as a result.

But as quickly as compounds are made illegal, new ones are created.

Josie Smith, from the Welsh drug testing agency Wedinos, said: “What we have found, certainly in the past year, is an increase in the strength of NPS [New psychoactive substances] drugs, not only the range of NPS that’s on the market, but some of the substances.

“They have addiction potential far higher than some of the controlled substances.”

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