What should I do about my group of friends?

Well..I personally don't think you should stop hanging with them..I mean they're your best friends! I wouldn't be able to live without mine..what you should do is just try to change and by change I mean not do weed. Like I'm sure your friends will understand if not then they wouldn't be really friends. Also when your hanging out with them and they want to do something bad you can change the subject or try to convince them that that's wrong or suggest something else to do. There are a lot of more ways to have fun you just have to look for them lol.