Question: what does it mean if you throw up from juuling?
Answer: Throwing up when (or after) vaping is, -as Elssa says-, a very good sign that you're Overdosing on Nic. Not that that's a bad thing in itself (apart from the nausea and possible mess you have to clean up if you're going 'all the way') but because its a clear indication that Nicotine is self-regulating.