Having suffered from said illness, smoking for entirely too many years, and vaping for a couple,
my experience is that my bronchials don't get clogged up as much or at all since I switched to vaping
and in fact get less clogged than when I don't vape.
It seems that vaping, especially VG based juice, softens up the mucous
making it easy to expel with a couple of coughs whereas smoking ciggies irritates the lungs
which in turn make more (hard to cough) snot.
I rarely use my inhaler since I switched to vapor
where it was a daily/nightly thing before.
I suggest that your friend try different VG/PG configurations,
stay away from custards and butter flavors, and keep her coils clean (always prefire b4 using a new coil)
Caramel and flavors with much sweetener can irritate the lungs.
Tell your bud to try to not inhale.
Hazy