Some people have allergies with pg so they raise the vg. Some just want bigger clouds so use higher vg. Pg carries flavor & throat hit better but less cloud. Vg mutes flavor, & less throat hit,but makes bigger clouds. For some people vaping works because of flavors, for some it's more about the similarity to smoking including clouds. And then for some it's both. If someone is saying vg is easier on their lungs they may be talking about throat hit being too harsh for them & preferring a milder hit so higher vg.
Almost verything about vaping is adjustable according individual preference. I don't put flavoings, juice, or pg/vg in fridge or freezer. They just sit in a cupboard with he 120ml bottle of nic I'm using for mixing. The rest of my nic is in a freezer. One liter divided into 120ml glass bottles so I can just pull one bottle at time to use, & I'm not warming to room temp, opening & reclosing & refreezing a full liter of nic.
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