I've had it happen from vaping too much @ too high mgs, but also from a specific flavoring (unfortunately, I can't remember which flavoring it was, but it was something citrus, or maybe it was hypnotica?).
PG/VG doesn't seem to matter for me, but PG certainly causes issues for some (seems often to be some sort of irritation esp throat), and less-often VG for others (usually related difficulty breathing - VG is thicker and heavier in the lungs, but not as irritating).
As Black Strat mentioned, some other ingredients can be problematic too. Cinnamon is one I usually caution new vapers to be wary of.
PS - you may want to relocate...as your sense of smell returns, it's gonna get tough for you in 'fartville'
