Anything is possible WITH God. I have found that some habits are easy to drop while others are harder. But we are human and as long as we recognize our faults and repent and ask forgiveness, we can keep on growing and maturing to become more like Christ. I think it is important to keep trying with the guidance of the Holy Spirit. Alone we will not be able. So thankful we have God's grace and mercy. The closer we draw to God the more and more we will change.