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