As reported in the San Francisco Chronicle, cancer rates in the U.S. have recently been falling an average of 2.3% per year. Much of the improvement comes from improvements in prevention and early detection of diseases, which are not available to all populations. From the article:
"...much of the progress we've attained in reducing death rates comes from tobacco control, screening and access to timely and high-quality treatment, and those positive effects are not being seen in all populations in the U.S.," said Elizabeth Ward, director of cancer surveillance for the American Cancer Society.
Exposure science can be a key player in educating people about the ill effects of smoking on themselves and those around them (via secondhand smoke). Prevention and exposure science go hand in hand.