[Primary cancer prevention by life style modification].

A large scale cohort Study, 1966-88 in Japan, for 265, 118 adults revealed daily cigarette smoking as the most important risk factor for cancer of all sites and major sites. The risk was observed to go up further when daily alcohol drinking and daily meat consumption are added to daily smoking, while addition of daily consumption of green-yellow vegetables was found to lower down the risk. Smoking cessation and nutrition improvement as represented by daily consumption of green-yellow vegetables, therefore, must be the most practical and promising strategies for cancer prevention.