The issue with vg is it has calories. VG is sort of Ike karo syrup that had a molecule flipped so it’s not sweet. Same amount of carbs though. The solution is low VG juice. VG is what produces the clouds so whatever else you use it wont puff as much. PG is common. It puffs some and does not have calories. Some people. Develop sensitivities though. Water works but its boiling point is very high so it’s quite hot. Also there is no cloud at all. It’s nearly invisible. Ethanol is hot too but less so. Its problem is it has calories too, and will get you drunk. VG, PG, and ethanol are all hydroscopic. They pick up water. Even a small amount of water will make clouds nearly invisible. Best bet is all PG, (or PeG, i don’t remember what it is but it is sometimes used to replace PG)the sweet is usually sucralose.