To successfully overcome evil spirit that leads to drug addiction, we have to accept Jesus Christ into our lives. Drug addiction is a state whereby people in it are helpless and need the help of God to overcome it. Admittance of the need of help is also very much vital in situations like this.
We have to be truthful to ourselves that we're wrong in what we're doing. True strength only comes when we rely on God instead on our own strength. When a someone humbles him or herself and turns to God in prayer, they commence a journey of transformation where God provides the strength to resist temptation and make better choices in life.
Addiction often begins from our mind before the action follows. As Christians we must renew our mind and always think the ways of God. By doing so we can be sure of overcoming addiction. Surrounding oneself with a supportive community of the fellow brethren, avoiding triggers, and staying committed to spiritual disciplines such as prayer and studying the Word can help build a new, healthier life.