Hi vapers, Has anyone any thoughts on the smallest vaping device without losing functionality/performance? The reason for going SFF is because I want it to be incognito and easier to carry. The smallest VV/VW mod with replaceable 18650 that I can find (and am currently using), is the iStick Pico. But it still seems to have a lot of wasted space. I use an Innokin iClear 30S dual-coil tank that holds about 3ml. I don't think it can get any smaller really. Its mouth piece is quite big though. Has anyone got a mouth piece recommendation? Thanks.