@blueiiznh
1) About the same danger, except that you also have to add in the other cars in the area too. The risks of traffic have more to back them up than the risks of second-hand smoke. Then again, I have pretty much taken the dangers of car exhaust to be so common sense and seen so much supporting evidence over the years that I not only assume it to be common knowledge, but also cannot understand how anybody who is so concerned about second-hand smoke could possibly not know enough about other respiratory hazards and pollutants to have a fair and balanced opinion. Therefore, I assume bias.
2) You really don’t want to get into the whole “choice” argument with me. Especially not today.
3) It means that I can see some instances where you have at least a leg to stand on and others where you don’t.
4) I saw no such clause in the original question. Please don’t make stuff up.
5) Have you lost anyone close to you because of brain cancer due to cellphone use? The links are about as conclusive, the risks about the same. An argumentum ad misericordiam will not only not work on me, but will also undermine your credibility and erode the respect I have for you.