Back then, it is a known fact that cigarettes were actually good for you.
Most adults smoked and they smoked real, unfiltered cigarettes like Luckies, Chesterfields, Camels and Pall Malls.
None of those limp-wristed Marlboro Lights for the real men and women of the 1950's ! Light cigarettes came later with the advent of light beer, both secretly backed by several LGBT groups.
It really is a fact that nicotine keeps the metabolism elevated and smoking unfiltereds gave you nicotine doses measured by the teaspoon rather than puny milligrams. When I was growing up in the 1960's, all of my aunts and uncles that smoked were rail thin. My parents, who never smoked, were stout like me.
So there you have it.