Some elements of smoke are attribute from the combustion supply. Guaiacol and its derivatives are merchandise of pyrolysis of lignin and therefore are attribute of Wooden smoke; other markers are syringol and derivates, as well as other methoxy phenols. Retene, an item of pyrolysis of conifer trees, is really https://broadfar.com/oraco-global-trends-in-heat-not-burn-products/