Why are we addicted to something that makes us feel so bad?

Does anyone have any insight into this?

I understand the science behind addiction and what makes it addicting. I just want to know why we keep going back to it and continue to use it when we know how awful it’s going to make us feel.

I know that every single time I’m about to relapse, that it’s going to make me feel terrible afterwards, yet there’s this insane urge to just go ahead and do it anyway. You would think that knowing how bad it’s going to make you feel, would deter you from using it. Just feels like sometimes fighting the urge only makes it harder to say no.