This article is all over the place which makes it a bit frustrating. It covers contents in the juice, marketing to teens and children, and the concept of using this as a nicotine replacement therapy.
First off, no one has bothered to disassociate the actual device with the liquid. Unlike a real analog, the device itself has no ability to do much of anything. So the issue here isn't the device itself nor the fact that the device is made in China. The question at hand should revolve entirely around the liquid.
Secondly, it is entirely possible to get the liquid without any nicotine (that is the direction I take as a non-smoker). The article doesn't go into this at all but rather focuses entirely on nicotine addiction. While it is certainly fair to address this topic, a note about the ability to get zero nicotine juice would have been more fair and balanced.
Thirdly, it is difficult to make out the overall issue with the liquid. I am not sure about the companies they mention; however, a place like Johnson Creek lists all of its ingredients. Now if we assume that list is correct, I am not sure where these other chemicals may come from. A scan of the internet on "nitrosamines" finds that it comes from a protein and is found in meat, fish, cheese, and beer. It does show itself to cause cancer in animals but is inconclusive in humans. However, where is this coming from in the liquid? Essentially we should see PG/VG, distilled water, flavoring, and maybe nicotine. I am not at all understanding where the cancer causing agents are coming from within this ingredient list. Now if other suppliers are putting other things in their liquid that would be interesting, however, the basic liquid contains what I described above. I could not find an ingredients list on NJOY's website.
It seems to me that most of these articles are annoyed that people look at these products as a smoking cessation device which they are not legally registered as yet. This is the first article I have seen that starts to get into the juice itself which is good, but clearly a larger study needs to take place. Again based on the ingredients I listed above I would really like to know where the potential cancer ingredients are coming from. I would assume the flavoring since PG is FDA approved as generally safe....