OK - really will be short: this morning, Sunday 6 January, there was a large unit on "To The Best of Our Knowledge", on NPR -- about Smoking. Cross my heart, I did NOT know this, had no prior knowledge, and was not paid by NPR to post my rant as a classy lead-in to their Sunday programming.
That being said - I encourage you to go to TTBOOK.ORG and listen to the program. It says all of what I was trying to say, with arguments fore and aft.
This is NOT from me having a cigarette in the back yard; it's foggy today. GOTCHA!