Answers

2016-02-14T19:17:41+05:30
You should advice your friend and tell him what is good and what is bad for him
you should make him realize the consequences of this bad company
you should  explain him with examples and practically 

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2016-02-14T19:17:59+05:30
First of all explain him/her properly and politely that how his new companies are harming him.If he doesnt understand you then also try and report his parents about his changed habits.
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