I'll also add that your draw technique is important.
A long, gentle draw of 4 - 6 seconds works best. Imagine sucking on a straw in a thick milkshake. Use your cheek muscles to draw the vapor into your mouth, then inhale the rest of the way into your lungs. Too hard of a draw can flood the cartomizer. If a carto isn't wicking juice as well as it should, doing "primer puffs" (pulling without the fire button on) every so often can encourage juice into the carto.
A long, gentle draw of 4 - 6 seconds works best. Imagine sucking on a straw in a thick milkshake. Use your cheek muscles to draw the vapor into your mouth, then inhale the rest of the way into your lungs. Too hard of a draw can flood the cartomizer. If a carto isn't wicking juice as well as it should, doing "primer puffs" (pulling without the fire button on) every so often can encourage juice into the carto.
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