Yes and No.. they don't actually go and put rat poison as such into cigarettes. However, some of the poisons naturally occurring in cigarettes match the main ingredients in rat poison. The list of dangerous ingredients is long, and you can see some of it here: http://www.drugabuse.gov/Infofacts/Tobac...
or, here: http://quitsmoking.about.com/cs/nicotine...
... However, if you look at the list, most additives are for flavor. At the same time, their quantity is much smaller than the quantities of tar and nicotine, and other cancerogenic substances... When I added a fluid containing most cigarette additives to fruit fly food, in three generations, I got little mutants..... my poor flies, wingless and deformed.....
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Heh -- this is kind of a trick question :} Let me show you how: First, Tobacco contains Nicotine -- an alkaloidal toxin. Doses that would kill a rat would not kill a human due to comparative body mass. But, in sufficient dosage, nicotine can indeed kill humans. This is why you spit when you chew tobacco. There are reports of nicotine being used as a rat or mouse poison, and of nicotine appears naturally in tobacco. Also, tobacco contains trace amounts of arsenic -- an elemental metal that is toxic to both rats and humans, and depending on dosage/body mass. Arsenic (in WAY larger dosage) used to be used as a rat poison, but no longer is, as it's very hard to remove from the environment and, as I said, is lethal to humans. The fact is that most modern rat poisons are hematoxins and, depending on dosage, are dangerous for humans as well as rats. So no "rat poison" is ever added to tobacco products, although you could say tobacco naturally contains toxins that will kill a rat, or eventually and in sufficient dosage, a man.
basically, ciggarites use smoke, and when ever you inhail it makes your lungs blacker.
It can make you die young, so never smoke!
Disease causes lungs to become discoloured. The undiseased lungs of smokers and non-smokers are difficult to tell apart, The 'smoker's lung' they show you in school, etc. is usually the diseased lung of a sheep.
But I totally agree with the last sentence.
If the nicotine in a package of cigarettes were injected intravenously, it could kill 50 people.
Cyanide is found in a tiny amount is cigarettes. Cyanide is also used to poison rats. The quantity in cigarettes is much smaller than the quantities of tar and nicotine.
Rat poison is not an ingredient of cigarettes though some of the impurities are closely related to poisons.