Filter/dilution tunnel. A smoke sample is drawn through a tube where by it truly is diluted with air, the ensuing smoke/air mixture is then pulled through a filter and weighed. This can be the internationally recognized way of measuring smoke from combustion.[sixty six] 1600 – Tobacco applied as funds-crop https://broadfar.com/non-combusted-cigarettes-a-safer-alternative-or-just-a-myth/