I remember my father who died as a result of cancer and systemic arterial disease. He always said he could quite smoking whenever he wanted. When his health was failing he really tried to quit and found he couldn't. How often the addict has said, "I was just gonna try a little, I never intended to become addicted." John 8:34 says whoever commits sin is a slave of sin. As in the first fall, Genesis 3, that road to slavery is paved with one or more lies (i.e. Has God really said...? or You will not surely die!) that help to ready us for a fall when we are enticed by our own lusts. Jesus Christ came to save us from the judgment and hell which we in our sin deserve. He also came to set us free from the power of sin. "Therefore if the Son makes you free, you shall be free indeed." John 8:36 One way our Lord liberates us from the power of sin is by displacing the demonic lies we believe with the truth of God's Word. "If you abide in My word, you are My disciples indeed. And you shall know the truth, and the truth shall make you free." John 8:31-32
Consider: If Satan wanted to hook you into committing a sin, with what lie would he bait you? Instead of believing that lie, forsake it and consider God's truth on the matter, and abide in that truth and the Lord will crush the serpent's influence over you and break the chains of slavery.