In all cases you will receive advice and help from the responsible youth welfare office and the addiction counseling centers.
Important information can be found here: https://www.suchtfragen.de/ and http://www.bw-lv.de/home/
Addiction counseling centers in Baden-Württemberg can be found at:
https://www.bw-lv.de/beratungsstellen/alle-beratungsstellen-anzeigen/#c2227
Country office for addiction issues Baden-Württemberg: https://suchtfragen.de/index.php/beratung