I smoked heavily from 11 to 30. And I failed at quitting many times before I succeeded. I don't think the 'how' is as important as really, really wanting it and truly being ready to quit. Every time you 'quit' make sure you do better than last time. Every time you start again make sure it's for less time than before. Until you 'quit' again.
What finally worked for me was the patch, if anyone wants to know how it went just ask. But I think that when you're truly ready, any of those stop smoking aids can make it a bit easier. If you're not truly ready, nothing is going to make it happen. So I guess the secret is the same secret to most things worth doing....NEVER GIVE UP!
In the immortal words of Thomas Beckett,
"Try again,
fail again,
fail better."
http://www.cnn.com/2015/05/29/health/why-you-quit-smoking/index.html