It's nearly 20years since I gave up. I had smoked 40 to 60 a day for years. I had also given up many times. I can't stand the smell of smoke now, but I also know that I could very easily end up smoking again.
As others have said. Once a smoker always a smoker. You may have stopped, you may no longer be smoking, but you are a long way from being an ex-smoker yet. Congratulations on what you have done so far but in my experience the hardest part is the second 6 months. It's at that stage that the temptation to have "just one" is at it's greatest.
Stick with it!