KNUTSFORD, UNITED KINGDOM - JULY 05: In this photo illustration a woman smokes an electronic cigarette on July 5, 2012 in Knutsford, United Kingdom. Electronic cigarettes are the latest health device for smokers hoping to quit nicotine addiction. Earlier today a major security operation took place in Staffordshire, England, after a passenger on a coach used an electronic cigarette which was mistaken for something more sinister and a full scale security alert was instigated. The 48 passengers were later allowed to carry on with their journey. (Photo illustration by Christopher Furlong/Getty Images)A woman smokes an electronic cigarette (file/credit: Christopher Furlong/Getty Images)