You might want to look that one up again, although it also cuts across perfect political lines. Forbes, CNN, Fox, Cato....they all cite studies with no clear link, then segue into how it's a coverup for another Obama secret agenda to fund overseas abortions. American Cancer Society, Cardio-Pulmonary Medical professionals, EPA, WHO, CDC all cite second hand smoke as a clear and proven hazard, with a few proclamations of "indisputable fact". Who are you going to believe? When science goes political, it's over.