Sound like your the self rightous one.
Everyone here knows that smoking is bad for your health, just as is drinking too much, eating too much, speeding while driving, and a host of other things humans do in their daily routine.
The point is, many chose to engage in risky behavior and its none of your business unless they seek you advice.
By the way, what is the life expectancy of a medical doctor? Is it longer or shorter than that of a ordinary mortal?
Depends if they smoke or not...
Then what's to account for all the apologists on this thread? One third of the population of our country (current and ex-smokers) is at high risk for this terrible disease and for multiple other tobacco-related diseases, including cancers of the mouth, tongue, throat, larynx, esophagus, pancreas, bladder and kidney, and also at risk for coronary artery disease, peripheral artery disease, gangrene of the legs and stroke.