给定一篇文章，要求模型检测其中的非法词汇，并将它们替换为“******”。 
文章： 
"John had a problem with his past addiction to ********. He attended weekly meetings and worked hard to overcome his addiction."
模型检测到文章中包含敏感词汇，将其替换为“******”： 
"John had a problem with his past addiction to *******. He attended weekly meetings and worked hard to overcome his addiction."