WEll yes, it stops developing when your 25.

But whats more important is that there is No reason to think cannabis or THC affects this development. Some drugs do and some drugs don’t. I believe studies need to be done.

But currently playing it safe isn’t a bad idea. But we must realize that THC is mimicking a naturally occurring substance in our brains. Unlike Caffeine and alcohol or even Tylenol but no one seems to care if that effects your development