Hitler on 11 March 1942, night --
"I am convinced that if I had been a smoker, I would never have been able to bear the cares and anxieties which have been a burden for me for so long. Perhaps the German people owes its salvation to the fact. So many outstanding men have been lost to me through tobacco poisoning."
Nazi physicians, notorious for euthanasia of the mentally ill and for gruesome experiments in concentration camps, were pioneers in research against cancer, which they viewed as a form of race pollution. Their work is written up in
Robert N. Proctor, The Nazi War on Cancer, Princeton University Press, 1999?; 380 pp.