Abstract
A number of commercial airlines have moved recently, under pressure from government or on their own initiative, to ban smoking on at least some flights. Yet measurements of the constituents of environmental tobacco smoke ("ETS") fail to support claims that exposure levels in aircraft affect adversely the health of non‐smoking passengers or crew. It appears, moreover, that the discomfort that can be caused by pollutants or environmental conditions aboard commercial aircraft often is misattributed to ETS because of ETS's visibility.