Okay I have another question. Me and my friend used to hang out all the time during the summer. But then this year he changed a lot. I don't know why but I just recently found out that he has been smoking weed and drinking all the time. I don't know what to do, and I try to hang out with him to try to get him to stop but he is always "too busy." I really need help.:(

Move on and make some new friends.

They are old friends, I'm not just going to drop them.
Thank you though.

Your friend is probably just rebelling or trying to be cool. I wouldn't give up on him completely but I would stand back just a little so that you don't get hurt to.
Just let him know you are there and keep trying to catch up cause one day when he wakes up and realises that you stuck through with him even though you both didn't hang out he will turn back to you!
Just have patience it may take awhile but don't give in stick by him no matter wha but be careful that you don't get hurt either!