In 2003, UCLA epidemiologist James Enstrom and I published a study of environmental tobacco smoke (ETS)—also called "secondhand smoke" or "passive smoking"—in the British Medical Journal (BMJ). Using data from the American Cancer Society's prospective study of 1 million adults, we concluded that ETS exposure was not associated with increased mortality.
Since that conclusion flew in the face of the conventional wisdom that had long driven state and local bans on smoking in public places, our study understandably sparked a controversy in the public health community. But the intensity of the attack on us in the pages of a medical journal—by critics who were certain that our study had to be wrong but typically failed to provide specific evidence of fatal errors—vividly illustrates what can happen when policy preferences that have taken on the status of doctrine override rational scientific debate.
