Cigarette.

"Why do we insist on slowly killing ourselves?" I asked out of curiosity.

"Well princess, sometimes people have nothing better to do than slowly kill themselves. Almost the same reason why we smoke." He took an extremely long drag from his cigarette.
"I don't understand."
"Why don't you use that pretty little head of yours and think about why you smoke." He blew out the smoke in oddly amusing circles before speaking again.
" Why do you smoke princess? Princesses are supposed to be perfect." His signature smirk appeared before my eyes.
" Well you see, i'm not as perfect as you think I am."