I've been told the more open draw creates more vapor but I haven't experienced that personally. Seems like the tanks I have with a more open draw produce a thinner vape cloud and irritate my throat. The tanks I have with a tighter draw, just from my own experience, create thicker vapor and don't irritate my throat as much.....I do realize the atty/carto head and custom builds are a factor but I'm using basic ~2ohm pro tank, iclear, kanger, ECA standard tanks.....I'm leaning more towards a tighter draw, what has been your experience and what do you prefer?