If you resent quitting?
If you are angry about not being able to smoke?
4 months quit doesn't mean a thing. 4 years quit doesn't mean a thing.
Whether you wanted to quit in the beginning or made the choice to quit, in time you will reach a point where your quit means more than being a smoker does.
You can't fight yourself and succeed at quitting forever. It takes too much energy.
Be Willing not Wrangling