A third major advantage of a clinical trial is that conditions are controlled as carefully as possible, minimizing potential biases. Both sampling and measurement bias are greatly reduced, if not eliminated. In contrast, survey studies are generally subject to significant sampling and measurement bias.

Moreover, the study was a laboratory study involving mice. How could these reporters possibly extrapolate from a mouse study showing impairment of healing and liver damage in mice exposed to thirdhand smoke to the conclusion that thirdhand smoke is as harmful as active smoking?

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