I hadn't thought about that! I can only recall the teacher's nickname (which wasn't exactly complimentary), and I'm not in contact with anyone from those days, so I guess it's a non-starter. Plus, during my school years we were all taught that if you did any drugs at all, you'd end up a disgraced heroin user that would end up on the streets and die, and all the teachers seemed to fully buy-in to this notion.
Lots of people in public positions have to buy in to those theories ala 1984, especially teachers.
You should definitely try and get in contact with that teacher! Go to the school and ask around, try to cross reference the years you studied with the teachers around, they must keep records surely