If you smoked herb youll be 100% fine you might feel a little strange for about at most one month. It sounds like you smoked PCP to me. Have you asked your sis bf about what exactly you had smoked? If it was pcp it could take longer but you should be fine. If it was pcp and you smoke it again you may never come back. Ive seen this my self. Someone I knew smoked pcp once and he never came back. From that day to this he is someone else (someone you dont want to be). You wont die from this so if you feel something strang just breath nice and slow and dont worry you are and will be OK!