There are thought to be more than 350 different varieties– and some experts think the fruity flavours might be getting young people hooked. Others think it could be part of many different factors. • Subscribe to ITV News on YouTube: http://bit.ly/2lOHmNj • Get breaking news and more stories at http://www.itv.com/news Follow ITV News on Facebook: / itvnews Follow ITV News on Twitter: / itvnews Follow ITV News on Instagram: / itvnews