Ecigs haven't been categorized as either a 'tobacco product' or a 'drug' yet. So, if asked if you had used tobacco products, you should say NO...and you wouldn't be providing false information.
Eventually, insurance cos. may amend their wording to include e-cigs, but until that is done, or the FDA categorizes them, they are in an unregulated grey area. If you are asked about products containing nicotine, then the answer has to be yes, but I've never seen that.
...If I eat "Chicken Marsala", which is made with wine,...do I have to say that I consume alcoholic beverages?