This is an old one, but I think it oft needs repeating. From an OSHA press release in 2001:

WASHINGTON -- Assistant Secretary for Occupational Safety and Health John Henshaw announced that OSHA is withdrawing an inactive indoor air quality regulation proposed in 1994. The decision was reached with the support of major anti-smoking public health groups including the American Heart Association, the American Cancer Society, the American Lung Association, Americans for Nonsmokers' Rights and the Campaign for Tobacco-Free Kids.

"Most of the activity on workplace smoking restrictions is now taking place at the state and local level," Henshaw said. "Today's action takes the positive step of setting aside what had become a contentious and unproductive effort. Of course, this action does not preclude future agency action if the need arises."

So in 2001, before any major bans on smoking were enacted, all these anti-smoking groups decided, "You know, we don't need the help of the federal government anymore. We're going to fight smoking on the city level with thousands of smoking bans rather than one easy federal smoking ban"

You need to ask yourself why would they ask OSHA to stop trying to prove that smoking is bad for you. Is it perhaps because they found out that second hand smoke is actually NOT harmful at all?!?

Read more about this in our Smoker's Rights Forum