I don't see a reason to worry about this. First of all, pg is used everywhere, and vaping being considered about 95% less dangerous than smoking at least says something about inhaled safety.
Then there is the reason for pg being there at all, there is probably a reason good enough to not remove it, and maybe you wouldn't like pipe tobacco that much without it?
And lastly, there isn't a "natural" pipe tobacco unless you grow your own completely. You can't be sure that the tobacco is completely organically grown and loved if you buy whole leaf.
This is a ridiculous discussion.
Then there is the reason for pg being there at all, there is probably a reason good enough to not remove it, and maybe you wouldn't like pipe tobacco that much without it?
And lastly, there isn't a "natural" pipe tobacco unless you grow your own completely. You can't be sure that the tobacco is completely organically grown and loved if you buy whole leaf.
This is a ridiculous discussion.