On one hand: Quit smoking! you're causing all your red blood cells to die horrendous, meaningless death!
On the other hand: If you smoke, a busty white blood cell comes over to slash all your bacteria with a katana!
Oh geez, the red blood cells aren't even the Imperial Guard in this scenario - they're the PDF. At least there's convent of Adepta Sororitas... I mean, white blood cells, nearby.