Tom Selleck, a non-smoker, temporarily took up the habit to play Dwight Eisenhower, who was, according to Selleck in the DVD's bonus feature, a four-pack-a-day smoker at the time. In 1949, Eisenhower was advised by his doctor and friend, Howard Snyder, to cut down on the cigarettes to one pack per day. Eisenhower initially did so, but after a few days, he decided that counting cigarettes was worse than smoking and quit permanently in 1949. He never smoked again.