If this is not your first time trying to quit, you are not failing at something everyone else gets right the first time. Research on smoking cessation consistently finds that most successful quitters needed multiple attempts before one finally stuck, often more than once, sometimes several times over.
That statistic gets mentioned a lot as a comfort, but it is worth taking seriously as more than that. Each attempt is not a wasted loop back to the same starting point. Something real usually changes between tries.
You learn your specific triggers. The first attempt is often a general plan against a general idea of cravings. By the second or third attempt, you know it is actually the drive home, or the first coffee, or a particular friend, and you can plan around the real thing instead of a vague one.
Your tolerance for discomfort shifts. Withdrawal that felt unbearable the first time often feels familiar, survivable, even boring, by a later attempt, simply because you have been through it before and know it ends.
Your reasons get more specific. "I should quit" becomes "I quit because of this exact thing I do not want to lose," which tends to hold up better under pressure than a vague sense that quitting is a good idea.
You stop expecting perfection. Early attempts often end the first time a slip happens, because the slip feels like proof the whole thing failed. Later attempts, informed by having relapsed before, are more likely to treat one cigarette as one cigarette, not a verdict on the entire effort.
None of this means the next attempt is guaranteed. It means the attempts you have already made were not wasted, even the ones that ended in relapse. They were data. If you are on attempt two, three, or five, you are not behind. You are closer than someone on attempt one, precisely because you have already learned what did not work.