There is a great variation in individuals. My grandfather started smoking unfiltered Camels when he was 7 years old and lived to be 81. Died from heart trouble, not cancer.
“My grandfather started smoking unfiltered Camels when he was 7 years old”
I smoke Pall Malls unfiltered and didn’t start until I was 11, can’t stand cigarettes with tampax on the end, and am only 72.