I do the same, I know I have enough but that nagging feeling of get more, get more really never goes away. I even dropped my Nic in half so have enough for way past my needsWith a little over 5L's of nic, I keep trying to convince myself that I have enough nic. But I look at Heartlands price, and I think, just one more liter, then I think, no, you have enough, and so on, and so on.