Why did Chandler leave friends in Season 9?

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Tags

1. #friends
2. #addiction
3. #character
4. #scenes
5. #vicodin
6. #schedule
7. #altered
8. #season
9. #became
10. #played
11. #filming
12. #matthew
13. #addicted
14. #first
15. #moved
16. #chandler
17. #perry
18. #featuring
19. #developed
20. #alcohol
21. #tulsa