I like to review the actual studies along with the peer review. I did not check every link but the ones I did just led to conclusions. At this point any study coming out of the CDC must be suspect because of there pattern of behavior where they seem to follow the money as opposed to the science. I do appreciate your article just challenging the science. I have seen a lot of claims on second hand smoke but they build a lot of conclusions based on a few studies that do not show any thing more than a rise in certain chemicals I am a non smoker. Quit about 20 years ago. Think the second hand smoke thing is way out of spectrum with reality. I appreciate you're article. Just challenging the science. Chlorine gas also has a pretty good link to lung cancer. Read those studies years ago can't quote them now. Appreciate the article and the conversation!