ETS and childhood cancer: Another theory up in smoke

The Associated Press reports that pregnant women exposed to secondhand smoke may increase their fetuses' risk of developing childhood cancer.

Study specific criticisms include:

Putting aside the specifics of this study, existing epidemiology does not bear out the theory that maternal smoking (primary or secondhand) is associated with childhood cancer. A quick Medline search revealed:

What's the lesson?

Weak study plus negative epidemiology = junk science

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