A campaign has been launched today to highlight the dangers of using the banned substance mephedrone.
It is estimated that more than 134,000 youngsters aged 16 to 24 have tried the formerly legal high, commonly known as 'meow meow'.
Cardiff bar manager Sian Hills told ITV Wales people that people often underestimate the power of the drug.
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Outbreaks of mostly light rain will arrive from the north tonight with hill fog likely.