Open Question: What doesn't produce smoke when burned (for hobo stove)?

Is there anything that produces very little smoke and smell when burned? And what would be the best thing to burn with the materials you can find at home or right outside your house? I want to test the little hobo stove I've made out of 2 aluminum cans without my neighbors noticing or smelling anything.

Source: http://answers.yahoo.com/question/index?qid=20110317165307AAXwM7P "> http://answers.yahoo.com/question/index?qid=20110317165307AAXwM7P

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