Gut gezokt. We often get so slaphappy when we are granted a few days, weeks, or months of clean time, that we get carried away with it.
Sometimes we misuse religious feelings at that point and start spewing divrei kedusha and chizzuk...sincerely assuming that we are 'worthy' now - after all, we are clean! It's poison.
Sometimes we misuse self-esteem feelings at that point and start patting ourselves on our backs (which are still so sore from all our self-whipping) and the gayvoh is unrecognized. We start spewing advice. It's poison.
Some of us misuse vigilance at that point, and become super-vigilant in order to protect what we have been given...but, of course, we didn't make it happen in the first place! It was a gift we were given by Hashem because we allowed Him to do that for us by getting out of His way. We had a touch of anivus, usually granted by the broken-heartedness of falling, itself. But now we lose it by being hyper-vigilant, thereby taking the credit. It's poison.
Gevalt, we need help more after we have been sober for a while than we do in the beginning! But not for lust cravings...rather, for the things that led us to needing our lusting behaviors so badly over the years: our fear, pride, resentment, and other complaints about life.