"For some reason, I had thought that the "party foggers" had a big opening
at low pressure (like the size you can put your hand through) but this one
in the Amazon picture seems to have a one-inch opening with a tiny 1/4-inch
nozzle. "

Some party foggers use ethylene glycol which is kryptonite to catalytic convertors. Word to the wise - use the starting fluid method.

That is the better method, and there are very very few reasons to use smoke.