I totally respect each individual's right to do as they please with their own body. I'm not the sort of person who believes in walking around telling people that they need to stop smoking. I don't particularly care for it when I'm forced to be around someone who is smoking because it aggravates my asthma.
However, I believe that it's good to be informed. This video shows a nice experiment that someone did using four hundred cigarettes (2 cartons). Check it out.