NOTE: as a cartomizer seems to get low or after it's been used, storing upright MOUTH PIECE DOWN allows the juice near the bottom of the cartomizer to get up to the atomizer (which is closer to the mouthpiece end and is first to dry out with use) I always store used but not empty cartomizers mouthpiece down for this reason.. to more fully use them up.
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Words of wisdom... This should have it's own post. Maybe even a sticky on how to get the most life out of a cart.