nicotine is an immuno-suppressant. Fact.

But a damn sight safer than the tar in cigarette smoke. Research is slowly filtering through.

I have to confess I don't like the flavours that you get a whiff of - strawberry ie. And I have noticed some vapers seem to need a hell of a lot of vapour - they are like a steam train starting on an up grade.

I would assume they are heavy smokers substituting extra volume to get the same hit.

FWIW company cars in the UK are classified as company buildings for the purposes of the law.