I've recently began making my own e-juice at 70/30 pg/vg @ 15mg. It seems to be a good viscosity for drip filling my cartos throughout the day. With warm weather approaching and the fact that I carry my juice in my pocket (in a case), will the juice become less viscous as the summertime temps. rise? Should I go 50/50 or even 30/70 to try to keep my juice at the same visc as it has been during these cooler months?