Note that my father died of inoperable lung cancer due to his smoking. Before the cancer was discovered when he was 69 years old, the doctor said that there was no reason that he should not be able to live another fifteen, twenty years, or more (his mother died at the age of 94). After the cancer was diagnosed, he lasted less than six months.
Yes, it is–and should be–a personal choice whether or not to smoke. However, anyone who smokes is a fool. Pure and simple.