For my mtl setup I go with an 18 mg juice. For my subohm stuff it's 6 mg. Tried 3 mg, but it wasn't quite enough. Bottom line, I'm happy with my vape, and I'm fine with the amount of nic I get (which is enough to have no thoughts about a smoke). Besides, when I'm not using a juice sponge like a L+, I only vape about 7 ml of 6 mg a day. Which still works out to less total nic than when I vaped ~3 ml a day of 24 mg at the start. And if I get a little nic want, I just vape as much as I have to until it's gone. Fortunately my tanks can keep up with a bit of chain vaping with several solid pulls, so no worries there.