In all cases you will receive advice and help from the responsible youth welfare office and the addiction counseling centers.
Youth welfare offices Mecklenburg-Vorpommern: https://www.kinderinfo.de/jugendaemter/mecklenburg-vorpommern/
Important information can be found here: https://www.suchtfragen.de/ and https://www.hls-online.org/
Addiction counseling centers in Mecklenburg-Vorpommern can be found at: http://www.lakost-mv.de/projekte/suchtnavi?field_art_tid=All&field_schwerpunktesuchtnavi_value=All&field_landkreis_value=All&sort_by=title