FWIW, I switched to > 90% VG, 5% max flavoring, and feel better. No more dry throat. No longer sleepy. No stomach acid/upset. Frankly, PG is kind of nice, relaxing, but I'm not sure it belongs in e-cigs. I kind of forgot for a bit, because I had some PG premix I liked, but the side-effects came back. Whoops. Back to VG.
Nicotine ? cut down from 48 to under 10 mg/ml. The only reason for still keeping some is almost sentimental. But I no longer scramble to look for the vape, and some of my juices are just VG with a few drops flavoring. I think most people should just get a bottle of VG with a lot of nicotine, say 50 mg/ml, and a big bottle of plain old VG, and a few tiny bottles of flavoring, a few plastic bottles to mix in, and that's it. Cheap, simple, tastes good.
My blood pressure improved a couple months after I started vaping, from 155/100 down to 125/82 most of the time with no beta blockers or thiazides. I know not to go near cigarettes, cigars. I quit THOSE the first day I got a vape stick down at the 7-11. Good riddance.
BTW, can someone point me to people that have a bad reaction to VG? BTW I think it's too small a molecule to be a true "sensitizer" (as in allergy), so what exactly are people experiencing?