However, the list of deadly toxins (by far) out number those in cigarette smoke. If you don't believe exhaust fumes are more toxic than cigarette smoke (first or second hand) , start your car and close your garage doors. You will die. I feel very safe in saying that I could sit in my garage while socializing with several cigarette smoker's for years without the same result.
BTW, please don't try this experiment !!
LOL. Good point. You would die of carbon monoxide poisoning. My point (rather, the CDC's), however, is that the quantity of toxins is largely irrelevant if your lungs self-cleaning capacity is functioning properly. The tar in cigarette smoke coats the lungs and prevents the cilia from doing their job. That's why smoker's lungs are black. For more info, see http://www.cancer.org/docroot/PED/content/PED_10_2x_Questions_About_Smoking_Tobacco_and_Health.asp?sitearea=PED