摘要：Toxic substances, such as carcinogens, pose a unique threat to human health and well-being (p. 3). 2 Carcinogens are invisible and often have long latency periods; moreover, significant exposure to them can be extremely harmful. In the United States alone, for example, more than 400,000 deaths per year result from cancer, 3 and conservative estimates suggest that between five and fifteen percent of these fatalities are due to workplace exposure to carcinogens?
