This is my opinion, for what it is worth:
I
assume that
vaping nicotine in a PG/VG base is safer than smoking cigarettes. There just isn't enough scientific proof
yet. It just hasn't been long enough nor have there been enough scientific studies done
yet.
Of all the hundreds or even thousands of flavorings, extracts, oils, etc, surely some will prove to be harmful. For example, diacetyl was used in flavorings for some time and it is now assumed to be unsafe.
Bottom line... I
believe vaping is safer than smoking and I'm willing to take the chance of using flavorings to help keep me from smoking. My working premise is to use the flavorings I like and watch the forum for clues to what I might choose to cease using.
So, is vaping flavors safe??? Nope, but I will continue to do it and thank God I lucked upon vaping!