If you've suddenly found yourself smoking again, after days or even months of being smoke-free try not to panic. Many ex-smokers tried to give up several times before they eventually succeeded. Perhaps you had a strong craving to smoke or were under stress or had a drink with friends. Perhaps you don't even remember lighting the cigarette. Maybe you thought you could have "just one".
Stopping smoking is a learning curve - you don't always get it right on the first attempt. But you can learn a great deal from your experiences.
Smoking one cigarette does not erase all of the smoke-free time you've accumulated. A lapse often occurs when an ex-smoker is placed in a situation in which he or she would have smoked in the past, but lacks a plan to cope without a cigarette.