Please don't worry OP, where and when to vape is a matter of etiquette, not health. They've found no evidence of harm to people who actually vape, let alone bystanders. See here for a good, evidence-based FAQ on ecigs. If you are unhappy about someone vaping in the workplace please do speak to your employer. ASH have produced a useful guide here to help employers decide on their vaping policy. It's not appropriate in all situations, just like eating and drinking are not appropriate in all situations.
WRT the formaldehyde studies (there have been a couple recently) - what the researchers did in both cases was to heat an atomiser to such a degree that nobody would be able to vape off it in real life. At normal operating temperatures, no formaldehyde was detected.
What the authors ignore is that these conditions, commonly called dry-puff phenomenon (which is explained in detail in one of my published studies), are easily detected by the vapers. In fact, overheating results in an unpleasant taste that none can withstand. As a result, no vaper is ever using the e-cigarette at such conditions and, thus, will never be exposed to such levels of formaldehyde. The story published in New England Journal of Medicine is similar to finding carcinogens in an overcooked piece of meat that none can ever eat. Of course the findings are true, but none will be exposed to the levels found. - from here
blackwidow74 - I don't allow them in my house as we are a non smoking house
I do allow them in my house as we are a non smoking house and vaping isn't smoking - nothing is burnt and there is no smoke, just a kind of steam, similar to what comes out of fogging machines used in theatre and at gigs. It's entirely up to you what you allow in your own home, however if you send vapers to stand with smokers you could very well be jeopardising their quit attempt (as well as, of course, subjecting them to second hand smoke when they no longer smoke themselves).
theonewiththenoisychild - i can smell the nicotine off the ecig
No you can't. Nicotine has no smell and very little taste. What you can smell is the flavourings. These are the exact same flavourings that are used in the food industry.