Filter/dilution tunnel. A smoke sample is drawn through a tube exactly where it's diluted with air, the resulting smoke/air combination is then pulled via a filter and weighed. Here is the internationally recognized way of measuring smoke from combustion.[66] Evanston firefighters responded to a single-family members home Sunday at https://broadfar.com/non-combusted-cigarettes-a-safer-alternative-or-just-a-myth/