Fermented dairy products, such as cheese, also contain significantly less lactose than plain milk. Therefore, in societies where tolerance is the norm, many lactose intolerant people who consume only small amounts of dairy, or have only mild symptoms, may be unaware that they cannot digest lactose. Eventually, in the 1960s, it was recognised that lactose intolerance was correlated with race in the United States. Subsequent research revealed that lactose intolerance was more common globally than tolerance, and that the variation was due to genetic differences, not an adaptation to cultural practices. Other animals
Most mammals normally cease to produce lactase and become lactose intolerant after weaning. The downregulation of lactase expression in mice could be attributed to the accumulation of DNA methylation in the Lct gene and the adjacent Mcm6 gene. See also
References
External links

Lactose intolerance at Curlie
Wade, Nicholas (1 March 2010). "Human Culture, an Evolutionary Force". New York Times.
In addition, governments often regulate industry, especially mines, to limit how much dust is in the air. In the United States, coal miners injured by pneumoconiosis and their families may receive monthly payments and medical benefits under the Black Lung Benefits Act. See also
Aluminosis
Black Lung Benefits Act of 1972
Chalicosis
Philip DArcy Hart
Pneumonoultramicroscopicsilicovolcanoconiosis
Popcorn workers lung disease — diacetyl emissions and airborne dust from butter flavorings used in microwave popcorn production

References
Further reading
Cochrane, A.L. ; Blythe, M. (1989). One Mans Medicine, an autobiography of Professor Archie Cochrane. London: BMJ Books. ISBN 0727902776. (Paperback ed. (2009) Cardiff University ISBN 0954088433. External links

"Pneumoconioses". NIOSH Safety and Health Topic. Center for Disease Control. 30 March 2022. "Black Lung Benefits Act". U.S. Department of Labor. Archived from the original on 2010-05-27. Retrieved 2007-03-02. Coal Workers Pneumoconiosis at Merck Manual of Diagnosis and Therapy Professional Edition
Black Lung — United Mine Workers of America
"Black Lung" (PDF). U.S. Department of Labor Mine Safety and Health Administration. Archived from the original (PDF) on 2010-05-30. A Conversation about Mining and Black Lung Disease
Flavorings-Related Lung Disease
The Institute of Occupational Medicine and its research into pneumocomiosis
Miller, B.G. ; Kinnear, A.G. Pneumoconiosis in coalminers and exposure to dust of variable quartz content (PDF) (Technical report). Institute of Occupational Medicine. TM/88/17.