Both of the following statements statements are true: > there is no level of [asbestos] exposure below which clinical effects do not occur > in general, peopl

Both of the following statements statements are true: > there is no level of [asbestos] exposure below which clinical effects do not occur > in general, people who become ill from inhaling asbestos have been regularly exposed in a job where they worked directly with the material If minimal exposure causes small effects, and maximal exposure - loose, lots of it, long periods of time - causes huge effects, you would expect the people who interact with it most to show the most severe symptoms. That does not mean the small effects are not present, only that they're smaller than the large effects. For an analogy, poking people with a penknife is not a healthy activity. Just because most people who die from or who go to the hospital for knife wounds were stabbed with larger knives does not mean we should promote poking people with small knives, and suggest that knife wounds are only bad if you're stabbed with large fixed-blade knives many times. Being worst in the latter case does not mean that they're benign in the former case. A headline that law enforcement are now allowing people to stab each other with small knives would be ridiculous.