I just wish the vendors would put a warning on those juices that are using oils.
All the the rebottled flavors I have gotten from heartland list the ingredients on the label, from that info you can do your due diligence and research those ingredients on vaping forums and sites (but I warn you, it's going to end up a cluster_ _ _ _ of various answers that are mostly just opinions).
None of these retailers are going to tell you this or that is safe to vape because they can't - both scientifically or legally.
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