Light one of those "
stage cigarettes" (the ones with no nicotine or tar) and put it in there. Make sure that it can't move, and extinguish it in water as soon as it comes off
stage.
Those "
stage cigarettes" if you are refferring to the ones that are sold by several different theatrical supply companies, actually don't light. they have an
LED in the end and only emit "
smoke" when the actor blows out as they have a little light-weight powder in them.
I've been thinking about this issue a
bit. I went by Hollywood Lights to
pick up a confettii
cannon this evening and I saw this toy I'm always intrigued by. It looks like a toy gun, you turn it on and it makes
smoke, with
fog juice, then you pull the trigger and it shoots a
smoke ring out the front. Perhaps there is a way to
build a battery powered
unit, something powered by a 9 volt then use some Nichrome
wire or heating
element wire the sits in a cup of
fog juice, turn it on and the
element heats up and starts the
fog reaction. If the Censer is swinging side to side, centifugal force is going to keep the
fog juice in the bottom of the "cup" while the side to side action is going to agitate the fluid enough to keep it moving and contacting newly heated areas of the
element.
Just an idea. Let me know what you come up with, I'm intrigued.