You are in a difficult position, and I sometimes feel like I'm in a similar one. There are two things you can do, ditch your old friends and try to find new ones, or try to bring your old friends up to your level.
I think the best thing to do is a combination of the two. The best thing you can do is question the thoughts and actions of your friends that you no longer agree with. Let them know you don't think drinking and smoking is a great idea anymore. Explain to them why you feel this way. You may find that they've had similar thoughts, but needed someone to push them in the right direction.
I think just leaving them for new friends is a bit low. These were people who you bonded with for some reason. It would be wrong not to share your feelings with them.
If they don't respond well, then maybe you will have to leave them.
You should also start reaching out to others whose thinking is more inline with yours. Forums like these are a good place to start, but real world relationships are much more meaningful, although they are much harder to find and develop.
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