In 1950s some DOCTORS were still recommending cigarettes to some asthma patients. The Journ Amer Med Assoc ran CIGARETTE ads til the late 50s. And only 1/3 of US doctors in 1960 were convinced about the evidence of health risks.. Wasn't just the Tobacco companies in denial back then. People try to make it MORE of a conspiracy than it was.
It was much like climate science --- whole lotta denial going on, whole lotta "yeah that evidence is overwhelming but still doesn't prove it" as we've seen in this thread. But there was also common knowledge that it was (is) a vile practice with lots of negatives.
This is from 1947 --very popular Western Swing of the era
FWIW the singer, Tex Williams, died of lung cancer, at age 68. About the same age my smoker grandfather died of the same thing --- when I was four years old.
In those times it wasn't at all unusual for people in their 60s to just keel over from heart attacks, if not get slowly wasted by creeping carcinoma. The curtailment of smoking is a main reason life expectancy has gone up since.