It won't add, it will average.
Which is useful if you want to lower your nic level slowly!
For instance, you can mix together equal amounts of 6 mg and 12 mg....and you'd have liquid that's in the middle: 9mg.
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To get REALLY tricky, you can always figure out the TOTAL mgs of nic divided by the TOTAL liquid volume. FOr instance:
Take 22 mls of liquid with 12 mg/ml. That's 22x12 = 264mgs of nic
Add 13 mls of liquid that's 6mg/ml. That's 13x6=78 mgs of nic.
When mixed together, you have 22+13 = 35mls. and In that 35 mls are 264+78=342mgs of nic.
Divide 342mgs/35mls, and the strength is 9.77mg/ml.
I know this is more complicated than your question, but it's a precise way of looking at it, and works for ANY combination, including mixing your own liquids. Total milligrams divided by total milliliters = your mg/ml strength.
cool thanks.
just to clear my stupid mind, so if i mix with different level of nic? 6mg than mix with 12mg? will the level of 12mg take over the 6mg become 12mg but will not increase to 18mg?