Does cigarettes have poison in it?

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.....