People are saying that cigarette smoking dont do much harm because they compare it to cars according to its size. I think that if the whole cigarette smoking community alive in the world would be have a "smoking day" and smoke at the same time, that would be equivalent to A LOT of pollutant smoke that goes up in the air. Just because a cigarette is smaller than a cars exhaust doesnt mean it doesnt have the ability to do as much damage. This is just my opinion. Of course, I havent done studies on it, but if you look at the larger picture, I think cigarette smoking can do a great deal of damage that many people cannot comprehend.