Ugh, Blu. Ever tried to put a standard 510 on a Blu? Can't. They use proprietary threading.
Uhhh..no they don't? Blu batteries and cartos use 510 threading...I have put the carto on my eGo a few times and it works fine. And why would you gag from Blu flavors? It's not like it's bad flavors, and it's all VG, so it should be lighter as compared to PG.
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