I have a question about E-cig. circuits. I just recently opened one. what im not understanding is why does it even have a controller? seems what the board wants to output is low voltage high current. that could be done with a direct connection from the battery to the coil. adjustment could be thru a simple potentiometer? least that's what I'm thinking the controller on the circuit board seems to be controlled by a pot. anywayz? so ya I'm wondering whats the deal with the board? thanks so much in advance.