"In terms of acute effects on respiratory function, active smoking is exactly equivalent to the effects of taking a math test."

Remember that I did not argue that a smoker switching from a non-filtered to a filtered cigarette brand will reduce her cancer risk. It may be that vigorous compensation offsets the impact of such a change. However, I do believe that the scientific evidence supports the contention that all else being equal, a lifelong smoker of non-filtered cigarettes faces a slightly higher cancer risk than a lifelong smoker of filtered cigarettes.

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