I doubt very much you read this article beyond the exerpted section. If you did perhaps you wouldn't be so smug.
"People who are well off may use it to chill out at the weekend. Kids here don’t have that luxury. If you feel powerless and everyone is out to get you, it reinforces that. It also disinhibits them; it takes away their sense of morality or the consequences of their actions. The link with mental illness is patently obvious. It infuriates me to hear people say it’s not proven; it’s as if their souls have been taken away.’"
There's plenty of real science mentioned in the article that supports the causal relationship between pot and mental illness. Maybe you should try refuting that, rather than simply scoffing at someone else's misfortune.