i was looking at an e-cig and wondering how it regulates watts. would it be viable to make your own? for those of you who dont know they run off of a 18650 3.7v battery that powers a coil. the coil is in the ballpark of .3 - 3.5 ohms. how do i get 30 watts of regulated power and jam it though a 1ohm coil from a 3.7 volt battery. or 25watts or 50watts. just whatever wattage i want.