There is very little research available which has been conducted in humans (as opposed to animal models) to answer this question

The gadget may get children hooked on nicotine, "a highly addictive drug," it said.Specialists say that with e-cigarettes, there is no tar buildup on the lungs as with traditional cigarettes, nor are there trace chemicals that come from burning paper or growing tobacco.But exactly what goes into the product and the conditions in which it is made can be hazy.And whether its bouquet of chemical gasses has an effect on the lungs or other organs remains unknown: there have been only a few health studies, none of them long-term.E-cig makers and users have submitted petitions with tens of thousands of signatures against the planned EU regulations, which they say will condemn many of the continent's seven million "vapers" to a premature death from cigarette smoking.Several associations have called for pickets in Strasbourg, France on October 7, the day before the European Parliament is due to vote.

Through analysis of a USA-subset of a large cross-sectional online global survey, we test the association between various spliff usage behaviours and likeliness to smoke the first joint within an hour of waking
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Southampton Airport - Use of e-cigarettes is not permitted inside the terminal building or while walking to or from the aeroplanes