This idea turned out to suck completely. Crappy supermarket caramel essence, at $2.60 for a 50ml bottle, is rubbish. Seriously, drinking it straight from the bottle tastes like slightly caramelly water. A 50/50 mix of the essence and the 36mg liquid had the effect of thinning the liquid to the point of not being worth trying to
vape, and the closest it came to having any flavour is that it was kind of like smelling a caramel milkshake that someone else is drinking.
A fun little experiment, though, I guess. At least I now know for a fact that supermarket essences are rubbish for this purpose.