Hello, I am new to e-cigs, trying to quit analogs. So far, so good. I got Blu's Classic tobacco disposable to try and I like it. The only thing is, when you smoke a regular cigarette, it burns down and it is obvious when you have smoked one cigarette, but with an e-cig, how do you know when to stop? In other words, how do you know (approximately) when you have smoked an equivalent of one regular cigarette? Do you count how many puffs you take? Does not seem practical. Are there any e-cigs out there that have a sensor or a counter of some sort that displays how many puffs you have taken? Thanks.