Self-control is what you build up, develop, create and learn by controlling your behavior
repeatedly. We should regard self-control as a skill. It is not a character trait or a thing
you have to have that lets you control your behavior. (or a thing that not having it
prevents you from doing so.) If someone says, "I have no self-control over my drinking
or drugging, or eating sweets or whatever," it might be asked, "Are you well practiced
at resisting your urges or opportunities to use or to overeat the wrong things?" The
answer would likely be, "No." This person is well practiced at giving in to those urges
and opportunities to use. (No criticism from me! I did this for years and years.)