I just don't see how further analysis of the chemicals in e-cigarettes are going to tell us any more about the safety of e-cigarettes than the fact that thousands of people have been using them to avoid smoking without serious adverse effects? For me the issue now, lacking any scientific evidence that e-cigarettes are causing harm to people and considering how much good they are doing, should be regulating the manufacturing, labeling and advertising of these products for quality control. The issue of safety is a moot point until or if we actually get complaints of serious illness or injury - and then those risks need to be evaluated compared to the health effects of smoking and how many people are actually affected - the same way they treated Chantix and hundreds of other products.
That's just how I personally see it, anyway.
There have been studies that showed some of the ingredients in juice were potentially bad- bad enough that popcorn makers removed it, but enough that public safety agencies have forced a reinvestigation of our favorite chemical because of the hazards on vaporized inhalation. Since I presume you were once a smoker, did you have immediate side effects from your cigarettes? Did everybody have immediate side effects from cigarettes? For myself, it took about 20 years before I started to to notice the effects of smoking. Ecigs have only been around for around three years here and four years in Europe. The use of flavorings is an even shorter time. It is entirely conceivable that in 15 years, there could be a lot of problems associated with ecigs. There have been a lot of people that have reported problems since starting vaping and they're quickly shut down as it being due to past cigarette use, an effect of quitting cigarettes, or the ever popular hypochondriac. Whether it's politically correct here to say it or not, there are a lot of people who have had respiratory problems with vaping and have stopped, some using Snus and others going back to cigarettes. But since it is an unknown, it's entirely possible that in 20 years, we'll find out smoking was the safer choice.