How Can I Help My Friend Stop Using Crystal Methamphetamine?

I have a very close collegue that unfortunately has fallen prey to this evil siren “Crystal”. I want him to stop it because I can see it hurting him and as a friend it kills me to see that. He is one of the world’s GREATEST people! I’m sure of that. The planet needs more souls like his. It is such a shame to see such an exceptional person waste away like this. Please reply with thoughtful courtesy and heart. Negativity and hate talk is not useful for me or any other living thing. Be a lover and help me help my brother! Thank You 🙂