Working on a golf course can be hazardous to your health. A survey of 618 golf course superintendents who died between 1970 and 1992 revealed that an uncommonly high number perished from cancer of the lung, brain, intestine or prostate. The culprit could be pesticide use, which has caused the demise of thousands of birds. The authors of the survey, from the University of Iowa, recommended that golf course workers "minimize their potential exposure to pesticides." They also suggested that cigarette smoking was a cause of many of the cancers, since golf course superintendents tend to be heavy smokers.