I would say it's probably a combination of his concussions and the money. If reefer was an issue with this team than Letroy Guion would be gone. This organization has been firm that they won't put players with serious long term issues on the field...plus they don't want to be on the hook for all 11 million if his concussion costs him another whole season.
Good player, great Packer. Wish him well. Hope he DOESN'T play again and that he takes care of his brain!