OK, first, let's make sure that nobody misunderstands what Abby said when she answered the question. The question was asked by a non-vaper who worked in an office where two people vaped, so when Abby said that that "you are not in danger" she was stating that there is no hazard from second-hand vapor.
Here is the article:
DEAR ABBY: I work in a small office with two former heavy smokers who have now transitioned to vapor/e-cigarettes. My concern is that they smoke their e-cigarettes in the office constantly, and I don't know what chemicals I am now breathing secondhand.
Both of them are senior to me in rank and age, and they pooh-pooh the notion that anything but water vapor is being exhaled. Am I making something out of nothing, or should I be worried about this? -- CLEAN AIR
DEAR CLEAN AIR: You don't have anything to worry about, but your co-workers may. In 2009, the FDA announced the findings from a laboratory analysis that indicated that electronic cigarettes expose users to harmful chemical ingredients, including carcinogens. However, those elements were not detected in exhaled vapor.
While we're educating Abby, we also need to educate the vaping co-workers of the person who asked the question. Evidently these vapers mindlessly repeated the oft-told lie that vapor from e-cigs is just "water vapor". I bought that load of hooey myself for a short while. It is NOT water vapor, unless all you've got in your device is water.
In fact, it can't be water, since atomization does not chemically alter your ejuice, it just vaporizes it. Nor does your body chemically alter the components although it may add to them with things that are already in your body. Vapor from e-cigs consists of vaporized vegetable glycerin and/or propylene glycol plus nicotine and flavoring, in basically the same percentages that they exist in your ejuice. None of those things are water except for whatever percentage of water may already be in the juice plus whatever small percentage is added by your own physiology. Somewhere on this site is a scientific analysis of vapor which verifies these logical truths. Pointing out the relative harmlessness of what's in our vapor is one thing, but lying about it isn't going to benefit anyone.
The current "Dear Abby", by the way, is the daughter of the original writer of the column, and neither one of them is named Abby.