[l_davis]

Could be going down the rabbit hole with this comment, but cancer is an extremely generic term - lots of different organ and cell types. And smoking is also less well defined than one might think - additives to cigarettes and paper are not, I believe, considered in most studies. And not all smokers develop cancer. I had two relatives who were heavy smokers and lived until their late 80s and didn't die from cancer. To summarize, there is lots that we don't know about cancer.

So I would agree that this could be out of the box thinking that could have some truth to it. But I also doubt that research will be done in that direction unless there is some proof that justifies the expenditure. So we're likely to not know for sure, and most will assume it's not true.