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Are you talking about the intelligent people that know smoking is not good for them and have nothing to gain by smoking, but they still continue to smoke anyway?
Not an attack on, I just found your statement... odd.
there are many things that can be considered self destructive. Hell, rock climbing isn't good for you, considering the people that end up killing themselves. Or you can hurt yourself working out, maybe something worse.... Alcohol isn't good for your liver. Greasy food clogs your arteries and gives you high cholesterol.
live life and enjoy what you do, I feel is a good maxim