My guess is that FDA sees these as medical devices, delivering an uncontrolled substance that has not been fully tested with full blown US clinical trials. I think they will clamp down on shipments from China sooner than later. IT is only a matter of time and as the demand increases, so does FDA's attempt at controlling it.
Once the clinical trials are done, most likely by a major US pharmaceutical company, then they will stamp an approval on it along with a whopping cost that will be obtainable by perscription only so that it never gets into the market as an OTC (over the counter) which could end up in the hands of minors. Kids are attracted to things that deliver cherry, strawberry, etc flavors as well as nicotine.
In my opinion I think you are either pre-disposed to smoke or not. I acted out smoking when I was 6 and started at 14 and now trying to quit at 51. If an ecig had been available would I have tried it? Probably but the peer pressure was to smoke regular cigs. Today, however, if a kid is going to smoke then give them the alternative choice to get started on a safe route. The kids who have seen my ecig are more facinated with it than any adult smoking friends or mine. At least it won't leave them with potential lung cancer or other deadly health problems after 20, 30 years of vaping. I don't think that will happen. Unfortunately the would be young smokers will probably have to stick with the deadly alternative and then when they can't quit, get a $300 perscription for an eCig. I just don't see the US allowing the sale of these but am keeping my fingers crossed and will continue to vape as long as I can!!! It is surely saving my life.