Health studies in Pennsylvania show links between some health problems and local fracking activity. Les Stone/Reuters August 25, 2016 Fracking and health: What we know from Pennsylvania’s natural gas boom Sara G. Rasmussen, Johns Hopkins University; Brian S. Schwartz, Johns Hopkins University, and Joan Casey, University of California, San Francisco Three studies find higher rate of health issues for people who live near large or many fracked natural gas well sites.