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Creosote, benzo (a) pyrene, dioxins, furans, carbon monoxide, sulphur dioxide and a whole host of others, but that should be enough to be going on with.

All wood, whether it's construction timber or straight from the pristine forest, contains sulphur and chlorine in differing amounts which produce some fairly unpleasant compounds when burnt.

It's all relative though, as so do cars, buses, trucks, planes and cigarettes (in much, much larger amounts).

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