I started smoking when I was eleven, can't stop, now I'm 28.?

I started smoking at eleven with my older sister at church. I try quitting but I always go back to it. I want to stay quit because the health benefits outweigh the thrill I get from smoking. In about 7 months I will be 29. I want to quit cause I know that I'm destroying myself. I have a family to live for and I feel I can be a better father figure if I quit. I will have more energy ya ta ya ta ya ta, etc. thank you Please could some one with a decade of quitting smoking let me know what I can do to stay quit.