Addictive substances is a false ecstacy. The soul is seeking soul freedom but often gets distracted along the way. Can meditation solve alcoholism? No, you need all the help you can get!
They key to overcoming substance abuse is seeking professional help but also praying for self honesty and integrity. Pray for others, think of others, how can you help others? Also occupy the mind with good habits. Hang out with sober people who are spiritually minded. Study the lives of saints and what they have overcome. Read the Autobiography of a Yogi by Paramhansa Yogananda.