Wrong logic.  There is an established link between smoking and lung cancer.  All these smoking seniors will be developing lung cancer, which will keep them frm aging.

(Interestingly enough, the medical profession in Nazi Germany made the connection long before cigarette manufacturers were forced to label cigarette packages with the words, "The surgeon general has determined that smoking can be hazardous to your health.", in the 1970s.  The German findings were suppressed for political reasons, and because they didn't conform to the1940s and 1950s version of political correctness.)