not really how it works, if 12mg is doing it for you, then 24 will be too much, it wont stop you using it less, it will just get you hooked on the higher nic and harder to drop, and even more so on the 36mg.
The trouble with these sticks, is they don't burn down like a cig, you have to know when to put it down, I was the same, constantly on it, all day, from the moment I woke up to the moment I went to bed, but that was just to cure the horrible cravings I was getting at the time, getting better now and not constantly on it anymore.
check out about dripping, I don't do it myself, and only recently learned what its is, but its a good way to get you to put it down.