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