I, for one, do not want VG-based liquid. PG has been thoroughly tested and has highly beneficial anti-bacterial effects. VG has not been as tested and has shown lesser anti-bacterial effects. I've used both. I'll go out of my way to order only PG liquid.
Bob, you should also consider that most of the bacterias we have in our body are good ones, our body need them, very few of them are bad ones, killing all of them doesn't sound that great...
try to imagine your doctor giving you some pills for a bacterical infection to be taken for 10 days, and you continue to get those chemical pills every day for the rest of your life... mmh it can't be good.
Also, is PG really an anti-bacterial? it was 'suspected' to be a possible germs/bacterias killer in a 1942 experiment with chimps but this potential doesn't show up in more recent studies for what i read on the internet.
anyway both of them (PG,VG) are toxicant 'suspects' as you can read here for PG:
PROPYLENE GLYCOL
and here for VG:
GLYCERIN MIST
and here there's a database search for all known chemicals, just type the name of the chemical and all about it will show up:
Chemical Profiles
many says Gliceryn (or Glicerol) is safer than PG as you can read here for example:
taken from a UK based Laboratory Test for Totally Wicked E-Liquids
"The primary aerosol forming solvent (Propylene Glycol) used in the preparation of the nicotine
solution is listed as a suspected respiratory toxicant. Pillbox 38 should look at changing the aerosol
forming solvent from the suspected respiratory toxicant Propylene Glycol, to an even safer solvent
such as Glycerol. "
and (on recommendations paragraph)
Pillbox 38 should take a Proactive look at replacing the Propylene
Glycol component completely with an alternative such as Glycerol, in
the event that the solvent becomes added to the list of respiratory
toxicants in the foreseeable future
on the other side somebody says that PG is safer than Gliceryn as VG can produce Acrolein when burning...
in the end, what's safer?
i don't know, anyway i believe inhaling PG and VG is for sure 1000 times less toxicant than analog smoking and like Bob says i believe we all need more tests and studies to be done all over this.