Some elements of smoke are attribute from the combustion supply. Guaiacol and its derivatives are products of pyrolysis of lignin and so are attribute of Wooden smoke; other markers are syringol and derivates, together with other methoxy phenols. Retene, a product of pyrolysis of conifer trees, is surely an https://broadfar.com/oraco-global-trends-in-heat-not-burn-products/