[WardL]

Diesel exhaust is carcinogen. Gasoline fumes and gasoline engine exhaust are NOT particularly carcinogenic. Benzene is found in gasoline and it is a carcinogen. The EPA is requiring gasoline to have substantially lower benzene in gasoline starting in 2011. It is not good to breath too much of almost anything. Second hand smoke is much worse than gasoline. Besides, I'm sure you are more likely to die in a Cobra crash than of Cancer from breathing exhaust gases. Back in the old days you used to be able to run your car in the garage and dye of carbon monoxide poisoning. Catalytic converters changed all that. Our Cobras will generate plenty of CO to kill you in your garage.