Oil is a concentrated extraction from herb (trim, popcorn buds, ABV, kief, ect).
I find the amount of anywhere between .05 to .1 g enough to lift me where I want to be for that moment, with the bonus of the hit being a fast effect in comparison to the slow creep of vaping or combusting.
I'm soon to try some omi carto's on my vv e-cigs to check them out, but I need that damn teeny weenie funnel as I can't find anything around the house that would substitute it.
I 'DO' like a Ti nail in a small bubbler as often as I can handle without becoming a dab whore