Why is it said that high nic juice (by high nic I mean 10mg and up) should not be sub-ohmed? It's only now with the nic salts juice that's coming on the market that the warning is there - not for sub-ohm use. That warning was never there for "ordinary" high nic juice. I've been vaping "ordinary" 18mg juice with a 0.6 omh coil. Why should I not do so? There's no point in being told not to do so, without an explanation of why not.