Some factors of smoke are attribute of the combustion supply. Guaiacol and its derivatives are products and solutions of pyrolysis of lignin and are characteristic of Wooden smoke; other markers are syringol and derivates, and various 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/