1. U.S. Department of Agriculture. Tobacco situation and outlook report. U.S. Department of Agriculture, Economic Research Service; 1997; Pub. No. TBS-239.
2. U.S. Department of Health and Human Services. Cigars. Health Effects and Trends. Smoking and Tobacco Control Monograph 9. National Cancer Institute; 1998. NIH Pub No. 98-4302.
3. Smoking habits of 800,000 American men and women in relation to their occupations;Stellman;Am J Industrial Med,1988
4. Surveillance for selected tobacco-use behaviors—United States, 1900–1994;Giovino;MMWR,1994
5. Cigar and pipe smoking and myocardial infarction in young men;Kaufman;Br Med J,1987