In fact, the bulk of the evidence suggests that the introduction of the cigarette filter, while obviously not making cigarettes substantially safer, did result in small but measurable declines in cancer risk. These declines occurred due to a tremendous reduction in tar yield, from levels as high as 40-50 mg down to less than 20 mg. The evidence suggests that further declines - to levels below this massive initial drop - were not associated with further declines in cancer risk.

Similar data from the U.S. would be very helpful. But unlike prior reports, these ones should quantify not only experimentation, but also regular use, stratified by prior status as smokers versus nonsmokers.

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