Why do people smoke?
I recently lost a friend to heart disease. He smoked a pack of cigarettes a day. About twenty years earlier I lost a friend to a heart attack due to cigarette smoking.
Does smoking give you so much pleasure that you are willing to take decades off of your life just to do it?
Yes. Smoking can be very enjoyable. I can't see my death so I can't possibly consider my own mortality in that sense. Dumb yes, but it's your answer.
My aunt died from smoking.
Smoking is very stupid