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A briefing from the Board of Science and the Occupational Medicine Committee (http://bma.org.uk/-/media/Files/PDFs/Working%20for%20change/Improving%20health /tobaccoecigarettespublicplaces_jan2013.pdf)

They are brazenly puffed on trains and even within hospital boundaries. E-cigarettes (vapes) are not regulated, although it has recently been announced that from 2016 they will be so by the Medicines and Healthcare Products Regulatory Agency (MHRA). 'NICE will then look again at the use of e-cigarettes'. An e-cigarette consists of a cartridge containing liquid nicotine, a heating element and rechargeable battery. In this briefing paper, it is stated 'there is no peer-reviewed evidence that they (e-cigarettes) are safe or effective...'. In addition, studies have reported that they are used by those who are less motivated to quit smoking and where smoking is banned. Then there is the issue of 'passive vaping'; anabasine, myosmine, and ß-nicotyrine, all putative harmful chemicals, and in half the products the carcinogen nitrosamine, have been identified.