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