Scientists begin investigating possible health impacts of e-cigarettes

I’ve never encountered an e-cig smoker/vaper/whatever in person, so I have no experience with this - is there a noticeable smell in the second hand vapour exchaled from e-cigarettes? If so, yes, I would happily support a ban on this - the same way I would support a ban on people who wear too much perfume/cologne in public. It’s just rude.