Ecigarettes are actually better for you than real ones, and not only that, they basically make it easier to quit using nicotine altogether (according to reports I've seen).
We have on the one hand a known bad thing, cigarettes contain all sorts of nasties, tars, combustion products etc etc
On the other we have propylene glycol and vegetable glycerin, nicotine and food flavours that get vapourised (not burned). These have no proven links to cancer, PG and VG are already used in food and in medicines, some for inhalation. Also stage-smoke. There's no reason to think they are anywhere near as hazardous as smoking, though we haven't got good long-term data yet.
Regulation of ingredients would be good, but smoking cigarettes and vaping is very far apart in expected health outcomes.
Due to how poorly regulated the liquids are it has the potential to be worse as well.