Teenagers these days have lessons in school about drugs, and the message they get is "cannabis is pretty harmless" so a lot of them try it
Do they, though, Mary? Mine didn't. He came home once and declared dramatically, "You are a drug addict, Mum". I was a bit
, until he told me it was because of all the caffeine I drink. I think the message he got from those lessons was that no drug is without risk of some kind.
I think schools endeavour to give the facts dispassionately - or at least, that's what they are meant to do.
I have spoken to my DS about alcohol far more than I have cannabis (which I have barely mentioned). This is because of my personal family experience of alcoholism, and it frightens me more. I'm sorry about what you've been though with your DS - if I'd experienced the same thing I'd probably feel as you do.
But my own experience (from my misspent youth, not boring present me) is alcohol = "Who wants a fight?" and cannabis = "Anyone got any Pringles?"
I do think that vulnerable people tend to self-medicate - whether with alcohol or cannabis, or even prescription drugs. So it's often a case of chicken/egg - which came first, the alcoholism or the depression, for example. same with cannabis.
But risk for risk, cannabis is safer, and I think that does matter.