Some parts of smoke are attribute with the combustion source. Guaiacol and its derivatives are products of pyrolysis of lignin and therefore are attribute of Wooden smoke; other markers are syringol and derivates, and other methoxy phenols. Retene, a product of pyrolysis of conifer trees, is really an indicator https://broadfar.com/oraco-global-trends-in-heat-not-burn-products/