In all cases you will receive advice and help from the responsible youth welfare office and the addiction counseling centers.
Youth welfare offices in Saarland: https://www.saarland.de/52388.htm
Important information can be found here: https://www.suchtfragen.de/ and https://www.hls-online.org/
Addiction counseling centers in Saarland can be found at: https://www.saarland.de/SID-1628FE6C-6B4A9820/217479.htm