Hey Steve. Ya know, makes no sense to me. You'd think with VG everywhere in just about everything we eat, smell and touch. Yet I ran into the heavy chest syndrome chasin' high vg DIY vapes with two different vg sources (most have no problems with). Ultimately I found a source that suited me. So yeah I agree with ya. Something for folks to consider…even if they never have.
Good luck all.
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Maybe it is just the way one is exposed to it, via heating and inhalation. I can't handle too much VG, either- heavy chest feeling and almost drowning feeling after a long session, yet I have no known allergies...
PG is everywhere, as well, and many also seem to be sensitive to it...