There are two main types of e-cigarette - open and closed ... There is also a removable mouthpiece. Closed system e-cigarettes use ready-made refills, which screw directly on to the e-cigarette's ...
San Francisco has become the first US city to ban sales of e-cigarettes. Yet in the UK they are used by the NHS to help smokers quit - so what is the truth about the safety of e-cigarettes?
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