I think VG kind gets my lungs tightened up a bit. A bit of a heavy feeling in my chest. But PG somewhat has the same effect. That's only WHEN I inhale. I try not to worry too much about the possible/unforeseen consequences of long-term, excessive vaping of PG and VG. We're guinea pigs for this stuff. So I forced myself to start on 0nic and use my e-cig like a cigar. I find this works better anyway because it seems you detect a lot more flavor when you give the vapor time to dance around your tongue rather than just wolfing it down into your lungs and blasting it out. I just kind of savor the vapor while keeping that oral fixation addiction at bay. I will admit, when I drink, I inhale lol. Understandable though when you're inebriated. Old habits die hard ya know? *puff, puff, chug, puff, jabber, jabber, jabber, chug, puff* But I figure its no worse than going out to a fog-filled club for drinks on the weekends like an orange coated socialite giraffe. But I digress.