Share 'PLEASE SOMEONE TELL ME IS IT A SIN?'

Is it a sin to drink alcohol? People have told me that it's not unless you abuse it and go crazy. So what do you think? AND is Marijuana a sin? It dosent say anything in the Bible about it. So is it? ~I've always wanted to know so when i get older i wont be guilty for doing it. Please Let me know! Thank you!