I do all VG except for the flavors in my DIY and want that fullness of vaporI drink water and tea constantly throughout the day, the heavy chest is 100% VG related. I discovered it early on as I started with 70pg 30 vg juice and didn't have any issues at all, as stuff started being offered in 50/50 and higher VG blends I started using them, it only took a very short while before I developed a cough and felt like my lungs were loaded up. I just can't tolerate too much VG. even 50/50 gets to me. Then I began DIYing and reduced the VG till the affects were gone. I've been solely DIY for a couple years now.
but noticed the same congested feeling that I didn't get when I bought PG or PG/VG blends.
Both Pg and VG seem to act as mucus solvents and expectorants but VG stays longer.
What percentage VG have you found messes with you the least?