Filter/dilution tunnel. A smoke sample is drawn through a tube the place it can be diluted with air, the resulting smoke/air mixture is then pulled via a filter and weighed. This is the internationally recognized way of measuring smoke from combustion.[sixty six] )[eighteen] Magnetic remanence, recorded inside the iron https://broadfar.com/non-combusted-cigarettes-a-safer-alternative-or-just-a-myth/