“Tobacco smoke in the environment and its possible effects on non-smokers is a subject which has been widely discussed over many years (1).” So begins a report from the most recent international workshop on ETS (environmental tobacco smoke). It is noteworthy, perhaps, that “discussion” was the characteristic first commented upon, rather than celebrating the research achievements that had taken place since 1974, when a similar workshop was conducted. In truth, since 1974 little has been accomplished with the difficult task of measuring ETS and determining its health effects. Most of the studies that have been published on these matters have been seriously flawed, though loudly hailed by partisans.