Some parts of smoke are attribute from the combustion resource. Guaiacol and its derivatives are goods of pyrolysis of lignin and therefore are attribute of wood smoke; other markers are syringol and derivates, and other methoxy phenols. Retene, an item of pyrolysis of conifer trees, can be an indicator https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/