how can I quit smoking?

okay I am not looking to be insulted here first off. Second I have been smoking since I was 16 now almost 22. I see the world changing and smoking becoming less and less accepted. Its annoying to inconvience people with it and expensive. Not mention the number of health risks. You would think that would make me quit but no I truly feel addicted. I get irritated without one when I want it I smoke about a pack a day and I hate it yet I can’t stop. When am bored I do it after I eat when I first wake up when I upset there is always an occasion. What can I do?