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