Fear of Smoking Relapse

I have a nagging fear that I can't seem to shake. I am stable in my quit right now, but the addict in me is telling me that 5,6,7 or 10 years from now I'm just going to pick up the habit again so what's the point of celebrating the fact that I'm a non-smoker now? Am I doomed to fail eventually? I know people who have started smoking again after YEARS of abstaining. It scares me.

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