my friend, an addict struggling with opiates and recently completely detoxed but still dabbling, only vaped a few milligrams as an experiment.
he said it worked but it seemed "slow" in comparison to nicotine.
i don't think that's it's really viable but we find this whole vapeing thing to be rather fascinating ... but it may well clog up the atomiser so it thing it's best left alone.
... but with potential !