I echo this! They're great!
Heather's Heavenly Vapes let's you choose the PG/VG ratio, with a choice of 100% VG. I believe some juices will have a warning if some of the juices may have some tiny levels of PG in them, because of the flavors in the bottle etc. This should normally not be a worry, unless you're very allergic, but it never hurts to be on the safe side. In any case, HHV make some really good flavors. I don't smoke baccy flavors, so I can't recommend any of those, but their fruity vapes are absolutely marvelous.
Another good one is
D&D Vapor. They make some special and out-of-the-ordinary flavors that are also all available in 100% VG. Really thick stuff. Best of all: they make among the cheapest juices you can find, without lacking any quality. Absolutely worth a looksie!
Personally I can get somewhat "whiny" in my chest from some juices. Peach from Vapor Station comes to mind. I love the juice, but sometimes my breath can get a little whiny, so I'm guessing there's something in the juice that might cause some inflammation or whatever that affects my breath, especially when I'm vaping while lying in bed. However, this isn't necessarily because of PG for me. It could just as well be the flavoring and some floral ingredients that affect me, since I have all kinds of allergies like that, 'cause other juices with PG haven't really bothered me. It's just that one that does this. So I guess this is something else to keep in mind for those of you with tons of allergies, like myself
