Environmental tobacco smoke (ETS) as a harmful influence on the health of nonsmokers has been a controversial topic since the early 1980s. The International Conference on Indoor Air Quality held in Tokyo examined in great detail the relationship between passive smoking and lung cancer as revealed by a large cohort study. The participants were all highly qualified and experienced experts of world renown in their own fields of specialty. The deleterious effect of cigarette smoking on health is considered an established fact and as such has been used as a basic weapon in anti-smoking campaigns....