Totally missed this one til now. Getting great ideas already. If you want more smoke you might try a wire wound resistor. This is with a 10 ohm 1 watt. I just might have one layin' around if you want to play with it. But be careful, you try to run this on 12 volts and you'll melt the plastic case on a piston type smoker.
Two things to watch for in the video, the little fan on the smoker, useful for a bunch of stuff, I have a couple keeping my Asp units cool, just in case, they're cheap (3 to 5 clams), and if you have hobby grade electronics they run great on receiver voltage, on ebay (1 inch fan) but shop around, and at the end you get a shot of some old style brass dual ratio gearboxes, still running great and I wish they still made them. If anyone has a set of those gearboxes you want to sell I'm interested. I still have one pair left, but those are earmarked for the Stug.