50ml last about 14days.....sssoooooo...(does math)

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60ml lasts 16.8 days

give or take a few decimal points.
Im using 4mg juice this week, about a month ago it was about 9mg and 12mg. There is no difference in the amount of juice I vape.
When I first started vaping I used 6-8ml of 18mg a day but leveled out after about 3months to about 4ml a day.
Even if I vape nic free it still seems to be about 4ml a day.