This document discusses the harmful chemicals found in both cigarette smoke and Nazi gas chambers. It notes that hydrogen cyanide, a lethal chemical used in gas chambers, is also found in cigarette smoke and causes lung issues. Similarly, it describes how carbon monoxide, a poisonous gas from car exhaust, is also present in cigarette smoke and prevents oxygen from binding to hemoglobin in the blood. Finally, it mentions that nicotine, the addictive substance in cigarettes, is also used as a pesticide to kill insects. The document aims to demonstrate the dangerous chemicals shared between cigarette smoke and other toxic fumes and gases.