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.
More top news
A couple from Newport have decorated their house and garden with thousands of lights to raise money for local charities
Take your waterproofs with you if you're heading out tonight! It's about to turn wet with mist and hill fog by the early hours!
Ian Paul Mcguigan and two men from Liverpool were caught after a police surveillance operation.