I'm a pretty experienced vaper, I've owned my share of rda's, Clearos, blah. But one thing I can't wrap my head around is why some nicotine juices aren't giving me a throat hit at all. It's almost like there's no nicotine at all, while other juices deliver it pretty well. I have 3 bottles here, all 6mg, but only one gives a nice throat hit while the others have none. Any reason for this?