I think the first thing people learn when they switch to vaping is to take a Slower Hit,
The second is whether or not they like High PG e-Liquids.
When I started vaping, there wasn't a lot of choice PG or VG wise. You either got All PG or All VG. For me, All PG was Way Too Harsh. All VG was Smooth but didn't have as much Flavor.
I found that for me, I like 30%PG:70%VG.
So if a person is starting out, and has two weeks of so under their belt, and feel their e-Liquids are Harsh or make them cough, I would suggest trying higher amounts of VG.
But of course, YMMV