The GS Air M came out after the one that you bought. The M can fit 4 ml. of juice and the GS Air (original) fits about 2. You'll like it. I smoked Kools too, so this GS Air will be right up your alley. It gives you a nice strong hit.I ordered 2 of these and replacement coils...
Eleaf GS-Air Dual Coil Clearomizer - $10.00 : Rocky Mountain Vapor, The Mountain top of Electronic Cigarettes
Not sure about the "M" part...
your welcome. I use this every day. It is very nice and well built.IMRs, that's exactly what I need! Thanks!