Again, we offer our users flexibility, so you can adjust based on your nicotine preference. NOTE: The Duos\\\" patented all-in-one atomized cartridge/filter is unique in its atomization process, thus requiring a smaller level of nicotine to produce the same effect as its 3-part counterpart The Trio\\\". Thus, the Duos\\\" 6mg is equivalent to The Trios\\\" 14mg level. See the chart below for a full explanation: