What Bebop said. He's got all the same information (and more), that I was going to type out. Thanks, Bebop! Saved me a lot of tapping on the keyboard.
As for the Kanger ProTank 3 with its dual coils? I have one and I'm less than impressed with the dual coil. So much so that I use a single coil and that gives me much better performance. YMMV.
Also, like what's been said before. Vaping is not smoking. You should never get any "smoke" unless you're dry burning a coil and you've way over done it to the point of burning your wick.