Wood gas is formed by the destructive distillation of wood. Amongst other gases, the main constituent of wood gas is carbon monoxide, a flammable (but highly toxic!) gas. Do not use this stove indoors.
Wood gasification offers a highly efficient and largely smokeless method for cooking.
Do not be tricked into buying a commercial wood gas stove with an electric fan. If you build your own stove properly then there will be sufficient air throughput without recourse to a fan. You will also save yourself a lot of money. Anyway, who goes camping and takes a fan with them!?
This video shows you the operation of a wood gas stove.
Plans for this (MIDGE) stove and other information on wood gas are at http://www.woodgas.org.uk
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