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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Rhian Morris from Bridgend has had severely impaired vision since birth and her seven-year old son Harley also has sight loss.
Welshman Thomas fell further behind the leaders in the Tour de France and admitted afterwards it was 'not my best day'.
The 3,500-capacity attraction will have a 'digital skin' and will host a range of events, such as gaming conventions.