Once You Know

In Berlin, there’s talk of opening the first legal marijuana shop in Kreuzberg, and in the circles I run in, that’s mostly good news. Weed, Club Mate by the liter, pirated TV shows—that’s just what happens in student flats. Nobody questions it.

But then you read the interviews, and it gets harder to stay casual about it.

There’s a psychiatrist at Hamburg-Eppendorf—Rainer Thomasius—who runs the addiction clinic for kids and teens. He’s rigid about this: legalization is a mistake, even for adults. His argument is about damage. Cannabis rewires the teenage brain in ways that stick around. It shrinks the hippocampus, where memory lives. About five percent of the young patients he sees develop psychotic symptoms. Some of them trigger full schizophrenia. Once they’re hooked, they’re hooked hard. One course of treatment isn’t enough to catch everyone who needs help.

Then there’s the kid who came through that clinic. He was eighteen when he talked about it—started with a joint, thought the whole thing was overblown. How could something that felt that good actually be dangerous? Half a gram a day at first, then a gram, then five. By the end he was spending six, seven hundred euros a month. Not even getting high anymore, just needing it to function, needing it to leave the house. Dropped out of school. Got thrown out of home. That’s when he finally understood he couldn’t do it alone. Therapy was the only way out.

The thing about legalization is the signal it sends. Kids see it and think their parents’ warnings were just paranoia. They don’t have the neural real estate yet to tell themselves to stop. And if you’re already wired for schizophrenia, this stuff can flip that switch years before it would have happened anyway.

So the argument against legalization isn’t really about freedom or nanny states. It’s about specific damage to people too young to see it coming. You can understand the case for legalization. You can also understand why knowing this makes it harder. Once you hear the stories, you stop having an opinion about it. You just know better.