Smoking and cognitive dissonance
Smokers often experience cognitive dissonance: they know that smoking is harmful to their health, but they continue to do it anyway. Most smokers alleviate their psychological discomfort by adjusting their attitudes toward smoking, toward their health, or both, by saying things such as, "I know plenty of 70-year-olds that smoke and they're doing just fine," or "I'm bound to die anyway, might as well enjoy it."
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