bottom line pg is in almost everything very inert chemical....
VG is definitely what I would be concerned about.
Having said that, as far as I can tell the tobacco flavor additives do NOT contain PG, they contain glycolene, which is similar but much different, and is designed to FULLY evaporate away, and leave only the flavoring behind.
This is just from some quick and dirty searching, by no means meant to be an absolute.
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