I don't want to rub it in (sorry Fran), but the forecast for the end of the week puts us in the 60s.....



And frankly, it's a bit dated (no VW) ...
Ummmmm.... hmmmmm.... It does have variable voltage. And since wattage is a function of voltage... wouldn't that make it, by default, "variable wattage"???
::insert exploding head gif here::
I own one, but am neither happy or unhappy with it. A "3" on a 1 to 5 scale.
Well, "Manual VW"...lol.
VW in e-cigs reads the ohm value of whatever coil you attach and then calculates the proper voltage for you. So it's a feature. It has to be designed to do that though.
Next, we'll want toilet paper that wipes our asses FOR us, with no thought on our part!!!![]()
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But one could calculate wattage based on voltage and resistance, yes? So one would adjust the voltage to get desired wattage.
Next, we'll want toilet paper that wipes our asses FOR us, with no thought on our part!!!![]()
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....
Next, we'll want toilet paper that wipes our asses FOR us, with no thought on our part!!!![]()
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Well why NOT?!? 
In my past experience, there are times when Niagara Falls itself would not get the "job" done properly.