I've always vaped at 6 mg, just like I smoked ultraLight analogs.  When I started doing DIY, I didn't add nic to the samples because it is too expensive to waste.  I'd let the samples steep for a few days and then vape to 5 ml to see if it was ok.  I've done a LOT of DIY.  After a month or so of no nic, I discovered that when I went back to my regular all day vapes, I couldn't take the flavor and effect of the nicotine.
That's not to say that I don't occasionally vape a bit of 6 mg, dit its not often.  So I guess I AM one of those guys who used ecigs to wean himself of of analogs AND nicotine.  I don't think, though, that I will ever quit 
vaping.  It satisfies the hand-to-mouth, hands and oral thing too well.
