At the rate I'm going, I will have some spare mini e-cigs to play around with. I think i'm going to fabricate a single mouth piece with 2 tubes attached to the refill cartridges (low to no nicotine to avoid overdosing) of 2 mini ecig atomizers and batteries and see how much vapor can be produced. Using 2 at the same time produces decent vapor, but its like sucking on 2 straws. To much air intake for a decent hit. Has anyone else tried this??? lol