Filter/dilution tunnel. A smoke sample is drawn through a tube where it is actually diluted with air, the ensuing smoke/air mixture is then pulled through a filter and weighed. Here is the internationally regarded method of measuring smoke from combustion.[sixty six] 1600 – Tobacco utilised as cash-crop – a https://broadfar.com/oraco-pioneering-a-smokeless-future-with-innovative-nicotine-delivery/