it will get them to act. And it seems like a really reasonable assumption, except for the fact that the science shows that warnings have very limited impact on behavior. So, graphic images on cigarette packets, for example, do not deter smokers from smoking, and one study found that, after looking at those images, quitting actually became a lower priority for smokers. So, I'm not saying that warnings and threats never work, but what I'm saying is, on average, they seem to have a very limited impact. And so, the question is: why?