I've been vaping for about a month, trying to get a feel for what I like, and what I don't, so there has been some trial and error. I started at 6mg, in an EVOD Twist, with an iClear 16, moved through 12mg, in CE5 clearos, and then in a Nautilus Mini, and a full size Nautilus, on a 30w iStick. I'm happy with my gear, but I have some 18mg on order, since the 12mg is not quite doing it for me.