I was wondering what are all the ingredients in a cigarette?

A long list: I am guessing you want to know what is in cigarette smoke. The known toxins are too numerous to list here and there are no doubt hundreds (maybe 1000s) yet to be discovered. The primary effect of these is to continuously kill the lining of the lungs - requiring it to regenerate it at a much faster rate than normal renewal. This leads to mistakes of rapid division which is cancer.