My mother was a cardiovascular pharmacologist and worked with many people who knew at the time that smoking was bad for your health (70s, 80s, 90s). She smoked

My mother was a cardiovascular pharmacologist and worked with many people who knew at the time that smoking was bad for your health (70s, 80s, 90s). She smoked for decades, but she observed that the doctors and phds she worked with that specialized in the heart and lungs were more likely to be smokers. She quit many years ago and is still around, thankfully.