You will always have problems, sometimes relatively big, sometimes relatively small.
When you quit you expect life to be all rosy and it it isn't. Life is the same. No change, apart from the added anxiety of the quit that we all have went through.
And since your mind is quite smart and like a kid that wants its candy finds all kinds of excuses and there are readily available excuses- the problems, well, your mind uses them and tells you to go back to "fixing" yourself the next hit.
Well, just remember how you felt now, when you broke the quit and smoked, and next time that urge comes, remember that feeling and decide if you want to go through it again.
You are in control, you control your mind, show that crybaby who's in charge!