I just watched the 1957 movie, Time Limit, directed by Karl Malden. In an argument between military officers, it casually mentioned that smoking causes lung cancer. I didn't think that the general public knew that until The 1964 Report on Smoking and Health from the USA Surgeon General. I also thought that Hollywood was an unrestrained promoter of tobacco use. Somebody in 1957 did not get the memo, I guess.