Is there any medical evidence which proves that electronic cigarettes are bad for your health? Figures suggest the number of people using electronic cigarettes in Britain has trebled in the past 2 years. Subscribe www.youtube.com/bbcnews Check out our website: www.bbc.com/news Facebook: www.facebook.com/bbcworldnews Twitter: www.twitter.com/bbcworld Instagram: instagram.com/bbcnews

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