Why do people where neckties or black hats? It’s called style!
Show me one smoker who actually decided to become a smoker! The decisions usually is about “should I smoke THIS cigarette NOW?”.
Furthermore there’s a widespread illusion that smokers get pleasure from smoking. Most people are unaware that the illusory pleasure is actually the reversal of nicotine’s withdrawal symptoms. Smokers can only experience a non-smoker’s normal state of mind with a certain level of nicotine in his blood.