alright then....
i would encourage you and your friend to read Galatians, chapter 6. Also, if you feel comfortable enough to do so, it is helpful for you to maybe share some of your own struggles. As a child of God, it is our responsibility to our brothers and sisters in Christ to call them out when sin is knowingly and accepted in one's life. This is not to be confused with judging but rather it is done out of love. The Holy Spirit convicts us of sin in our own life not out of judgement or condemnation but out of love.
We strive to be Christ like in our own life not out of guilt or because it's what we think we should be doing, but it is out of love for our Savior who shed His blood and died for us.
Also, you can share I Corinthians 10:13
i will continue to pray for both you and your friend. This is an excellent opportunity for both of you to grow in you faith.