1) It's been proven time and time again that it's terrible for your health. It kills you people, end of story. You WILL die earlier than you would normally if you did not smoke
2) It's expensive! $3 a pack is a lot of money. If you smoke a pack a day that works out to almost $100 a month, and $1200 a year! Don't you have better things to spend you money on?
3) You stink! No one thinks the lingering smoke smell that goes with you everywhere you go is good! You stink, stop smoking you'll make more friends.
4) Cigarette butts litter all american cities. It's gross! You're littering and ruining the planet for the rest of us.