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Congratulations on the 65th birthday of granddaddy of all cohort
studies! That reminds me of a famous research article from Japan. Thirty
years ago, Dr. Hirayama reported the relationship between passive smoking
and lung cancer in BMJ (1). Before his death in 1995, he left a good joke
from his cohort studies. Tobacco is a Yokozuna (grand champion of sumo
westlers) as the cause of cancer. Because both of them are smoking (Sumo-
(1) Hirayama T. Non-smoking wives of heavy smokers have a higher risk of
lung cancer: a study from Japan. Br Med J 1981;282:183.
No competing interests
16 February 2011
Japanese Red Cross Hiroshima College of Nursing, Hatsukaichi City, Hiroshima, 738-0052, Japan