Also, as a side note, the lower the ohms (resistance), the hotter the atty gets. So, theoretically, a low resistance atomizer at 3.7 volts his a hotter and, someone can correct me if I'm wrong, thicker vape and/or harder the throat hit (depending on your juice). I personally don't really like a LR atty because it gets too hot for my taste and I feel like I am hotboxing a cigarette. I believe a general rule is 2.0 - 2.5 is close to a typical cartomizer. I use 3.0 cartomizers and like the mellowness of it, but that's my opinion.