Passive Smoking Presentation by the Verband Der Cigarettenindustrie at the Occasion of the Nma’s Workshop in Washington D.C. 830920 (http://tobaccodocuments.org/pm/2501021630-1639.html):

“The war declared on smoking [...] would become a deadly threat to the long-term survival Df our industry if passive smoking could be proven to be a real health hazard.”