How would I go about making a Prop Smoke? I want to give the illusion something is on fire inside of the box and have smoke come out.

I should have looked further down the page it seems that James has asked the same question

Thearter Effects smoke cup. For the flames, just use the novelty burning pot. It is a pot that uses an orange fabric and the built in fan make the cloth dance just like flames. Very realistic looking.

Another is Dry Ice method. Have to handle this carefully, though.