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Lynn T. Kozlowski, PhD
Addiction Research Foundation University of Toronto

JAMA. 1986;256(23):3214.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.—

Benowitz et al¹ find statistically significant decreases in exposure to smoke products when switching to ultralow-tar cigarettes, but not when switching to low-tar cigarettes. In light of the between-groups differences in baseline scores, a direct test of interaction² would be preferable to the less conservative separate tests of significance for groups 1 and 2. Were changes in exposure from usual- and high-tar compared with ultralow-tar cigarettes significantly greater than the comparable changes for the low-tar group?

Benowitz et al note that ventilated-filter cigarettes are susceptible to a special technique of compensatory smoking, namely, the blocking of filter vents with fingers or lips.³ They leave the impression, however (p245), that they have taken into consideration the issue of hole blocking and find that smokers are still unable to compensate fully with ultralow-tar cigarettes.

Unfortunately, the authors report no direct or indirect assessments⁴ of whether . . . [Full Text PDF of this Article]

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