Get a few buddies, lock yourself in a garage for a few hours and smoke up a storm and see what happens. Than try it without smoking and a car that's running and see what happens.
You will die from asphyxiation with the car; You will not be able to breathe. Cigarettes cause cancer because they contain chemicals that are radioactive. Very small amount, and they are just alpha emitters. With alpha emitters, the radiation can be blocked by a thin piece of paper, but when you put it directly into your lungs you are possibly getting a very high amount of radiation in your lungs. When I say high, we are still talking trace amounts here. That is why it takes years to do damage, if it does.
I have not read everything, nor do I care, nor am I making any foray into yours and his argument. I just thought I might point that little bit of science for everybody.
I am free of all prejudice. I hate everyone equally.
- W. C. Fields