In the DC section 89 verse 3 concerning the Word of Wisdom it says;
"Given for a principle with promise, adapted to the capacity of the weak and the weakest of all saints,who are or can be called saints."
In Romans chapter 7 it tells of this battle! Let's go through it! Let's take smoking for an example, yet any continual sin or addiction can be applied.
For we know that the law is spiritual: but I am carnal, sold under sin. For that which I do(smoke) I allow not: for what I would( not smoke),that do I not; but what I hate,(smoke) that do I. If then I do that which I would not,( smoke)I consent unto the law that it is good. Now then it is no more I that do it, but sin that dwelleth in me. For I know that in me(that is, in my flesh,) dwelleth no good thing: for to will(not smoke) is present with me; but how to perform that which is good I find not.( can't quit ) For the good that I would(not smoke) I do not: but the evil which I would not, that I do.(smoke) Now if I do that I would not,(smoke) it is no more I that do it,but sin that dwelleth in me. I find then a law, that,when I would do good, evil is present with me. For I delight in the law of God after the inward man: But I see another law in my members, warring against the law of my mind,and bringing me into captivity to the law of sin which is in my members. O wretched man that I am! who shall deliver me from the body of this death? I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin.
For the creature ( those that can be regenerated) was made subject to vanity, not willingly, but by reason of him who hath subjected the same in hope, Because the creature itself also shall be delivered from the bondage of corruption into the glorious liberty of the children of God.