Filter/dilution tunnel. A smoke sample is drawn through a tube the place it can be diluted with air, the ensuing smoke/air mixture is then pulled by way of a filter and weighed. This can be the internationally regarded approach to measuring smoke from combustion.[66] 1970 – Tobacco makers lawfully https://paxtonzqdqc.ktwiki.com/1355385/new_step_by_step_map_for_cigarettes