Translation of Polygraph

It actually happened to my cousin's youngest kid. He was repeatedly warned not to smoke in the courtyard of the school. At the end he found himself expelled from the school. It could have been an interesting experience for him though.
I have always met nice people so far, and I have never had a strange friends request. So far I only had problems with my grammar in various foreign languages that I am trying to acquire.
Many thanks for the corrections. Exactly what I needed to be happy. I want to learn French because it's a great language and because it sound so romantic to me. There is a lot more to improve.