FWIW, this is a case-control study, which has huge limitations in generalizability of conclusions. You probably learned about them in your intro to statistics c

FWIW, this is a case-control study, which has huge limitations in generalizability of conclusions. You probably learned about them in your intro to statistics course. Take this with a grain of salt. Case control studies in themselves can't prove causation. It can, however, make shadowy insinuations that are definitely worth following up on in a more rigorous way. The first indications smoking caused lung cancer came from a case control study.