Sometimes blowing clouds is more important than breathing...
lol
My personal opinion is that the thickness of VG makes it harder to clear out quickly.
But it's just a theory.
Sounds like a good theory to me...... I am certainly no physician (would never want to be either) but I can tell you of my experiences regarding
vaping/breathing ........... I have mixed lots of juices of various ratios of PG/VG and I noticed that whenever I use juices that get up to around 80% VG and above then it starts getting somewhat difficult to breath.
I do not think it is the PG because PG usually provides other problems and those problems usually show up immediately..... I did fine with my
vaping until I started mixing high VG juices and then the breathing problems began. So, I have reduced the VG in my juices and the problem has went away.