We have no decent medical evidence of any kind before the middle of the 20th century that would satisfy a medical statistician. Everything is all swamped together -- people died of pneumonic diseases of varying kinds that were not diagnosed or sampled properly, etc.

I would be very surprised if the lab tests on smoking mice never got lung cancer. It sounds like an urban myth, like the cars that run on water that were hushed up by General Motors.

yours,

Peter T.