As far as "PG is actually registered by the EPA as a pesticide" I have not seen a reduction in critters around here in the last 8 months that I have been
vaping.
From all that I have read the bacteria that pg attacks is mostly to do with respritory infections.
In my experience so far this has been true. It does not in my opinion and experience attack the good bacteria in our bodies. But I ain't swearing on any Bible yet. Give me another year of
vaping