Filter/dilution tunnel. A smoke sample is drawn via a tube wherever it is diluted with air, the resulting smoke/air mixture is then pulled through a filter and weighed. This is actually the internationally identified technique of measuring smoke from combustion.[sixty six] 1600 – Tobacco made use of as funds-crop https://broadfar.com/non-combusted-cigarettes-a-safer-alternative-or-just-a-myth/