Health Minister Lesley Griffiths says she does not consider mephedrone use 'a huge problem' in Wales.
But she added that educating people about it now will raise awareness of the dangers and help prevent people trying the substance in future.
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It'll be a grey and dry start for most of us, with showers in far western fringes tracking northeastwards throughout the day.
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It'll be a mostly dry but blustery night with a risk of a few showers around Pembrokeshire as we head into the early hours of the morning.