i still dont get it

Why people smoke? I need somebody to tell me the logic behind it.
1. Smokers are smelly. I just hate the smell.
2. Smoke suffocate me. Go away.
3. Its a waste of money. Full stop.
4. Obviously effecting your health. Do i need to tell more? Why suffer if you can choose a better way?
5. Its hard to stop so why even start?