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