A co-worker of mine is pregnant, and was commenting that she was going to be visiting a friend of hers that smokes "e-cigarettes" (sometimes known as "vaping").
She was concerned that her friend might not consider it to be the same thing as "regular smoking", and therefore she might have to have a potentially awkward conversation about not "vaping" around her while she was pregnant.
I know a couple of people who are really into the whole e-cigarette thing as a "safe alternative to smoking". Some of them really believe that it is not only 100% safe, but that it generates nothing that anyone else would have cause to complain about (one person went so far as to try and convince her supervisors at work that it wouldn't be against policy for her to use it in the office).
Is there evidence are data that can be cited as sufficient cause for a pregnant woman to request that e-cigarettes not be used around her (aside from the obvious of it simply being courteous to agree to a request like that)?