Mother's concern for son's relationship and cannabis

I am sitting and wondering about the letter from “a miserable mother”. I can completely relate to her situation. Actually I have a similar problem, which is hunting me day and night.

My son at age 18 and I have always understood each other, we have stuck together through thick and thin since his drunken and careless dad left us almost 15 years ago. My son has always been a sweet, affectionate boy. He has always stood by me in good and both critical situation. I have succeeded to raise him so his always been really helpful for an example he unsolicited took out the garbage every morning. He has always taking care of his things, been nice in school and all that kind of stuff.

But now all this is just a thing of the past. Because two month ago he met a girl, or to say it out clear so to speak, a really little bitch at age 16 who has, as I could understand from my son, had a number of sexual relationships since the age 14. It is my clear view that the girl has seduced him and dragged him into all kinds of things, like partying far into the night, smoking weed and a hyper monetary consumption. And she is not shy of having sexual intercourse with my son so to speak right in front of me, when she is visiting our home.