Besides:
All I know is that VZ flavors are top notch, you only need a small percentage of flavoring which by itself is a big plus over other flavors that are not concentrated. the proof is in the pudding: I rarely need to clean my coils, hardly any gunk get's build up on my coils. There are people who vape liquids that actually can break/crack your tank and add up to 30% flavoring!!!! you think that can be any good to your health if you inhale that into your lungs? Medical discussion is not what this thread is for. Nobody knows for sure if it is bad for you, we can only assume by the fact that we feel better. Breathing will also kill you, best is to stop living then. Just enjoy the ride, don't be so nervous about it coming from China and if you do, move on and buy what you think is good for you. After almost vaping for four years, I can say that my health has improved, I feel good and vaping has made me feel in general better. Now is that good? Best would be not to vape at all, but again what fun is that.
BTW: I get my VG, PG and NIC from a friend who has a lab and all is 100% pure, USP grade or higher. He made some test with VZ liquids and assured me that it is clean, no heavy metal traces or anything to worry about. He also stated that because you use such small amounts that there is really no problem, even if it comes out of China.