Shop here and enjoy free shipping with no minimum when you buy replacement coils for your SMOK tank. Whether you're looking for SMOK TFV12 coils or TFV8 coils -- or coils for another SMOK tank -- you'll find them right here. Sub-ohm tank coils typically last a few days each, so remember to stock up each time you buy e-liquid. To maximize coil life, use moderate wattage settings when vaping and ensure that you always fill your tank promptly when the level of e-liquid is low. Ensuring that your coils always stay wet is the best way to make them last as long as possible.