Is there scientific proof that smoking causes cancer? Of course there isn’t. What is there are opinions coming from often flimsy collection of data with a largely faulty procedure promoted in Germany by the Nazis, whose chief Adolph Hitler, obsessed with health and hatred of smokers, ordered up antitobacco pseudo-science to demonstrate that his hatred of tobacco was rooted in science rather than in ideology and/or emotions.
Unfortunately, after the war the Nazi junk science was furthered, and more and more epidemiological studies proliferated to support an Eugenics ideology that indeed preceded and continued after the Nazi regime. Today multifactorial epidemiology based on unverifiable questionnaires is everywhere, and at the base of endless regulations, obligations, and prohibitions that kill economies and freedom.
What is worse, both the public and many "experts" actually believe that interviews with unverifiable answers by people who are already heavily influenced by propaganda (if not already sick, so in search of a rationalization of their disease), often about memories of decades earlier, can be turned into precise numbers. This numerical nonsense is called "science" to the point of excluding real science. In effect biased opinion has become "fact" while fanatical peeves become "the causes" of all the ills of the world. The evils and the evil ones must be eradicated to the benefit of the technocratic Master Race. This is Eugenics and this is how it lives on.
This travesty is in fact both symptom and cause of the intellectual and societal rot at the heart of these very bad times.