The easy reduction in nicotine was happening long before the new and improved gear.What has also happened over the years is the delivery devices (AVPs/mods/attys) have become way more efficient in delivering nic into the system actually forcing a lot of vapers to reduce their mg/ml because newer equipment/higher v/w/subohm was making them nic-sick at their "usual" mg/ml, but, that does not really equate to less total nicotine intake, it equates to less mg/ml to achieve what older gear could only deliver at higher levels of mg/ml.
Some of the "newer" folks on the forum may not be aware of that, but it still remains true.
I have posted a few times regarding how the new gear is distorting what is reality.