They couldn't have the sheeple like you believing that SHS was harmless, so they convened a group of "experts" at the International Agency for Research on Cancer (IARC), people whose make their money from being anti-tobacco just a surely as Phillip Morris makes their money selling tobacco, to tell credulous twits like you that it was OK to look down on and abuse 25% of your fellow citizens without giving property owners a CHOICE on whether or not to go smoke-free.
Repeat for emphasis:
IT IS NOT ABOUT SMOKING OR NOT SMOKING! IT IS ABOUT THE RIGHT OF ADULT PROPERTY OWNERS MAKING A PERSONAL DECISION ON WHETHER OR NOT TO ALLOW A LEGAL ACTIVITY ON THEIR OWN PROPERTY!
Get the picture?
The picture is the owner must provide a safe environment for the patrons if he or she will continue to operate a public establishment. I doubt that you would listen to any study by anyone that said that cigarette smoke is dangerous to people who inhale it. To me, that is a no-brainer, regardless of studies. Next, you will be saying that coal miners don't develop black lung fever. Anything that you take into your lungs has an impact. The lungs can cleanse themselves to a certain extent, but a long period of exposure to smoke does take its toll.