e-cigarette regulation europe news US follows EU in restricting e-cigarettes – POLITICO The EU's Tobacco Products Directive:

One study found that after the cigarette flavor ban took effect, many youth simply switched to flavored cigars and menthol cigarettes

Such an increase may cause adverse effects hitherto absent

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K.HarveyK.GispertS.et al (2004)

By eliminating the combustion or burning process - as is the case with smoke-free products - there is no smoke and the levels of harmful chemicals generated can be significantly reduced compared with cigarette smoke