Smoke and Dust

Over at the Volokh Conspiracy, David Bernstein notes that the media is jumping to conclusions about a recent study showing lower than expected birthweights by babies carried by “women who were pregnant and at or around the World Trade Center during or after the terror attack”: he’s right that the correlation between low birth weights and exposure to smoke and dust does not prove causation.
Um, why smoke and dust? I know the article he links to rules out “post-traumatic stress disorder” based on surveys, but isn’t it possible that women who were in or near the towers on September 11 suffered from a greater than normal amount of stress, fear and anxiety?

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