How to help my friend who's heading toward an early death?

Hey, it sounds like your friend is going through a rough time. It is good to see she has a good friend like you who cares about her well being instead of joining in it with her. I have been where your friend is once and it all started when I was 13. It started with skipping school, smokeing some weed and drinking a bit and by the time I was 17 I was homeless, had been addicted to cocaine and done every drug thier was, been in many many horrible situations and i never had friends like you who cared my friends were by my side doing it with me and now my friends are in jail, dead, homeless and drug addicted. You are very right when you say she is on the road to death but it will not be a quick death it will be a long dramatized horrendous road to death. Now your friend may just be experementing which is alright but if she continus or gains addictions then she is doomed. This might hurt for me to tell you this but as long as your friend wants to be doing drugs etc she will never quit, you can not make anyone do anything they do not want to do. Your friend is on a long and painful road right now and she has NO idea how her behaviour now will effect her in the future. I have seen this many times before and I have been in her shoes and I honestly think the best help she can have is just simply doing what she is doing. It took me 5 years to learn my lesson and the only reason I learnt was because I lost my family, lost my friends, lost my boyfriend and ended up in jail. . She will probobley learn her lesson in the long run the hard way and it will not be nice at all.. Thier is nothing that can be said and possibly nothing that can be done but if you want to try the best way is to try and show her that there are other ways of having fun then acting how she does and thats all i can suggest also you should totally make it clear that what she is doing is in no way cool or mature.