Thanks, everyone!

I appreciate the advice.
What I'm trying to do is re-build an almost-life-size horse puppet that I've used for various things over the years (the Headless-Horseman-on-a-horse, a Lord of the Rings Ringwraith-on-a-horse, etc.), and I'd love to figure out a way for it to breathe smoke out of its nose. So having tubing from its nose through the neck to some kind of mechanism I can access in one hand and operate would be the ideal situation. I wouldn't use it all the time--there are times when I'm wanting the horse to look friendly, and wouldn't need the smoke, but others when the smoke would be a neat additional effect...