Are the Dangers of Secondhand Smoke Now Unsettled Science?

At one time doctors recommended low-fat diets to their patients until researchers discovered that diets high in carbohydrates dramatically increased the incidence of type 2 diabetes. Over at LifeZette, Dr. Brian C. Joondeph reports that even though it was considered settled science, it now appears that secondhand smoke does not cause heart attacks. He writes:

Smoking is hazardous to our health. It’s also the leading cause of preventable death in the United States, according to the CDC. And from a public health perspective, there is no doubt that cigarette smoking increases the risk of heart disease, stroke and cancer.

What about secondhand smoke, however — is it similarly dangerous or just an annoyance? A recent article in Slate examined the association with some surprising results.

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