I don't suppose any of you guys bothered to actually read the Slate article... did you? Of course not. Because if you had you would have seen that it doesn't actually disprove that second hand smoke is harmful.
What the article discusses is when cities starting enacting smoking bans and scientists started looking at changes in the number of deaths due to heart attacks they initially found significant reductions. Some of these early studies were used to push more smoking bans in more and more places. Problem was that these studies were both too small and flawed. And as larger cities, then states, and finally whole countries started to do the same the studies got bigger and better. And now we can see that early studies were obviously wrong about smoking bans preventing large numbers of heart attacks. Problem is that this is all that was disproven. There is still lots of evidence and plenty of debate surrounding the the many other effects of being exposed to second hand smoke.
Now as far as I am concerned the Slate article was written by someone with a fair amount of bias against smoking bans but makes some good points and is basically correct. But the Powerline article is just more denialist BS.
First it talks about the Tobacco Settlement and how the EPA under Clinton issued it's report on second hand smoke in the middle of negotiations. This is a lie. The EPA report was published in 1993 almost a full year before the first state lawsuit against the tobacco companies started in 1994. You can learn about the
Tobacco Master Settlement Agreement on Wikipedia.
It also claims that the EPA was saying that second hand smoke was almost as bad a first hand smoke. This is another lie. And if you want to see the report you can find it but it is over 500 pages long. I would instead suggest reading
this EPA response to criticism of the report. It covers both what the study is about and explains their reasoning.
And then the biggest lie of them all is that the Slate article disproves the EPA study. It does not because the EPA study never even addresses the effects of second hand smoke on heart attacks.
So.... the notion that this Slate article shows anything about the EPA's calculations of the social costs of carbon is pure fantasy.
You guys have been suckered yet again.