How do smokers evaluate evidence that smoking harms health? Some evidence suggests that smokers overestimate health risks from smoking. This book challenges this conclusion. The authors find that smokers tend to be overly optimistic about their longevity and future health if they quit later in life.

Older adults' decisions to quit smoking require personal experience with the serious health impacts associated with smoking. Smokers over fifty revise their risk perceptions only after experiencing a major health shock--such as a heart attack. But less serious symptoms, such as shortness of breath, do not cause changes in perceptions. Waiting for such a jolt to occur is imprudent.

The authors show that well-crafted messages about how smoking affects quality of life can greatly affect current perceptions of smoking risks. If smokers are informed of long-term consequences of a disease, and if they are told that quitting can indeed come too late, they are able to evaluate the risks of smoking more accurately, and act accordingly.

Nuclear bombs in suitcases, anthrax bacilli in ventilators, tsunamis and meteors, avian flu, scorchingly hot temperatures: nightmares that were once the plot of Hollywood movies are now frighteningly real possibilities. How can we steer a path between willful inaction and reckless overreaction?

Cass Sunstein explores these and other worst-case scenarios and how we might best prevent them in this vivid, illuminating, and highly original analysis. Singling out the problems of terrorism and climate change, Sunstein explores our susceptibility to two opposite and unhelpful reactions: panic and utter neglect. He shows how private individuals and public officials might best respond to low-probability risks of disaster—emphasizing the need to know what we will lose from precautions as well as from inaction. Finally, he offers an understanding of the uses and limits of cost–benefit analysis, especially when current generations are imposing risks on future generations.

Throughout, Sunstein uses climate change as a defining case, because it dramatically illustrates the underlying principles. But he also discusses terrorism, depletion of the ozone layer, genetic modification of food, hurricanes, and worst-case scenarios faced in our ordinary lives. Sunstein concludes that if we can avoid the twin dangers of overreaction and apathy, we will be able to ameliorate if not avoid future catastrophes, retaining our sanity as well as scarce resources that can be devoted to more constructive ends.