Filter/dilution tunnel. A smoke sample is drawn through a tube where by it can be diluted with air, the ensuing smoke/air combination is then pulled via a filter and weighed. This is the internationally acknowledged way of measuring smoke from combustion.[sixty six] 1970 – Tobacco makers legally obliged to https://broadfar.com/non-combusted-cigarettes-a-safer-alternative-or-just-a-myth/