That little coil in a glow plug won't do diddly.

The bottom line is, the bigger the engine, the better the smoke.

I get excellent smoke with a 91 4-stroke - that's the smallest engine I have tried it on, but I may try it on a 75 2-stroke this summer.

For more good smoke info, read this:

[link=http://www.rcuniverse.com/magazine/article_display.cfm?article_id=455]Got Smoke?[/link]