In the same wikipedia article >A history of asbestos exposure at work is reported in about 70 percent to 80 percent of all cases. This means in 20 to 30 perce

In the same wikipedia article >A history of asbestos exposure at work is reported in about 70 percent to 80 percent of all cases. This means in 20 to 30 percent of all cases, health effects occur in subjects who do not have periodic exposure to asbestos at work. 20 to 30 percent is not negligible.