Steven Stellman - Smoking habits and tar levels in a new American Cancer Society prospective study of 1.2 million men and women

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      Stellman, S. D., Garfinkel, L. 76 (6) 1057-63-

      Abstract: In 1982 the American Cancer Society   (ACS) enrolled over 1.2 million American men and women in a   prospective mortality study of cancer and other causes in   relation to environmental and life-style factors. Biennial   follow-up is planned through 1988. At the time of enrollment,   23.6% of the men and 20.0% of the women were current smokers of   cigarettes. Compared with a similar ACS study of 1 million   subjects enrolled 23 years earlier, among men the proportion of   current smokers was halved and that of ex-smokers doubled, while   among women the proportion of ever-smokers increased by 10% and   that of ex-smokers quadrupled. Most smokers of filter cigarettes   had smoked nonfiltered cigarettes earlier in life. The median   year for switching to filters was 1964, the year of the first   Surgeon General's report. More than one-third of male smokers'   and one-half of female smokers' current brands had tar yields   below 12 mg; less than 9% of male smokers' and 4% of female   smokers' current brands had tar yields of 20.2 mg or more   (nonfilters). The study population differed in many respects from   the general U.S. population; the study population had, for   example, a much higher average educational level. Nevertheless,   distributions of smoking habits changed a few percentage points   after adjustment to the educational level of the general   population.

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