The authors of this study make one of the most cardinal errors in all of epidemiology. They ignore the principle that "correlation does not equal causation."

Without adding a descriptor of some sort, the cigarette companies would not have been able to distinguish their sub-brands. For example, Marlboro "Lights" would now be called "Marlboro." Marlboro "Ultra-Lights" would now be called "Marlboro." And Marlboro "Milds" would now be called "Marlboro." Thus, there would be three brands on the market, all called simply "Marlboro," and consumers would have no way of telling them apart.

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